Embodiments described generally relate to guard rails. More particularly, such embodiments relate to highway guard rails.
Guard rails are a safety barrier intended to shield a motorist who has left the roadway. Guard rails are typically made of galvanized beams that are designed to deflect or redirect a vehicle back to the roadway or slow the vehicle down to a complete stop.
The present disclosure is best understood from the following detailed description when read with the accompanying Figures. It is emphasized that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion.
It is to be understood that the following disclosure describes several exemplary embodiments for implementing different features, structures, or functions of the invention. Exemplary embodiments of components, arrangements, and configurations are described below to simplify the present disclosure; however, these exemplary embodiments are provided merely as examples and are not intended to limit the scope of the invention. Additionally, the present disclosure may repeat reference numerals and/or letters in the various exemplary embodiments and across the Figures provided herein. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various exemplary embodiments and/or configurations discussed in the Figures. Moreover, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed interposing the first and second features, such that the first and second features may not be in direct contact. Finally, the exemplary embodiments presented below may be combined in any combination of ways, i.e., any element from one exemplary embodiment may be used in any other exemplary embodiment, without departing from the scope of the disclosure.
Additionally, certain terms are used throughout the following description and claims to refer to particular components. As one skilled in the art will appreciate, various entities may refer to the same component by different names, and as such, the naming convention for the elements described herein is not intended to limit the scope of the invention, unless otherwise specifically defined herein. Further, the naming convention used herein is not intended to distinguish between components that differ in name but not function. Additionally, in the following discussion and in the claims, the terms “including” and “comprising” are used in an open-ended fashion, and thus should be interpreted to mean “including, but not limited to.” All numerical values in this disclosure may be exact or approximate values unless otherwise specifically stated. Accordingly, various embodiments of the disclosure may deviate from the numbers, values, and ranges disclosed herein without departing from the intended scope. Furthermore, as it is used in the claims or specification, the term “or” is intended to encompass both exclusive and inclusive cases, i.e., “A or B” is intended to be synonymous with “at least one of A and B,” unless otherwise expressly specified herein.
The terms “up” and “down”; “upward” and “downward”; “upper” and “lower”; “upwardly” and “downwardly”; “above” and “below”; and other like terms as used herein refer to relative positions to one another and are not intended to denote a particular spatial orientation since the apparatus and methods of using the same may be equally effective at various angles or orientations.
Further, the terms “guardrail” or “guardrails” and “barrier” or “barriers” may be used throughout this application to include any type of guardrail and/or barrier which may be formed at least in part using cables, guardrails and support posts incorporating teachings of the present invention. The term “road” or “roadway” may be used throughout this application to include any highway, roadway or path satisfactory for vehicle traffic. Guardrails and barriers incorporating teachings of the present invention may be installed in median strips or along shoulders of highways, roadways or any other path which is likely to encounter vehicular traffic.
The post 200 can be secured to a base on the roadway (not pictured) in a multitude of ways. A bolt 230, 231, 232, 233 or other mechanical fastener can be drilled or otherwise disposed through both the holes 240, 241, 242, 243 in the post 200 and the supportive base. In another embodiment, the post 200 may secure in the ground itself, without the need for the base, using concrete footings, tension anchors and cabling, or other means apparent to those skilled in the art.
The rails 300, 302 can be made from one or more fiber reinforced plastics, such as one or more fiberglass composites. Any suitable material, however, can be used to fabricate the rails 300, 302. For example, suitable materials can include, but are not limited to, any one or more metals (such as aluminum, steel, stainless steel, brass, nickel), wood, other composite materials (such as ceramics, wood/polymer blends, cloth/polymer blends, etc.), and plastics (such as polyethylene, polypropylene, polystyrene, polyurethane, polyethylethylketone (PEEK), polytetrafluoroethylene (PTFE), polyamide resins (such as nylon 6 (N6), nylon 66 (N66)), polyester resins (such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), PET/PEI copolymer) polynitrile resins (such as polyacrylonitrile (PAN), polymethacrylonitrile, acrylonitrile-styrene copolymers (AS), methacrylonitrile-styrene copolymers, methacrylonitrile-styrene-butadiene copolymers; and acrylonitrile-butadiene-styrene (ABS)), polymethacrylate resins (such as polymethyl methacrylate and polyethylacrylate), cellulose resins (such as cellulose acetate and cellulose acetate butyrate); polyimide resins (such as aromatic polyimides), polycarbonates (PC), elastomers (such as ethylene-propylene rubber (EPR), ethylene propylene-diene monomer rubber (EPDM), styrenic block copolymers (SBC), polyisobutylene (PIB), butyl rubber, neoprene rubber, halobutyl rubber and the like)), and mixtures, blends, or copolymers of any and all of the foregoing materials.
The rails 300, 302 can have an ultimate lengthwise tensile strength that is less than 90,000 psi, less than 80,000 psi, less than 70,000 psi, less than 60,000 psi, less than 50,000 psi, less than 40,000 psi, less than 35,000 psi, less than 30,000 psi, less than 25,000 psi, less than 20,000 psi, less than 15,000 psi, less than 10,000 psi. The rails 300, 302 can have an ultimate lengthwise tensile strength that is between 5,000 psi and 90,000 psi, between 5,000 psi an 80,000 psi, between 5,000 psi and 70,000 psi, between 5,000 psi and 60,000 psi, between 5,000 psi and 50,000 psi, between 5,000 psi and 40,000 psi, between 5,000 psi and 30,000 psi, between 5,000 psi and 20,000 psi, between 10,000 and 90,000 psi, between 10,000 psi an 80,000 psi, between 10,000 psi and 70,000 psi, between 10,000 psi and 60,000 psi, between 10,000 psi and 50,000 psi, between 10,000 psi and 40,000 psi, between 10,000 psi and 30,000 psi, between 10,000 psi and 20,000 psi.
The rails 300, 302 can have an ultimate crosswise tensile strength that is less than 90,000 psi, less than 80,000 psi, less than 70,000 psi, less than 60,000 psi, less than 50,000 psi, less than 40,000 psi, less than 35,000 psi, less than 30,000 psi, less than 25,000 psi, less than 20,000 psi, less than 15,000 psi, less than 10,000 psi, or less than 5,000 psi. The rails 300, 302 can have an ultimate crosswise tensile strength that is between 5,000 psi and 90,000 psi, between 5,000 psi an 80,000 psi, between 5,000 psi and 70,000 psi, between 5,000 psi and 60,000 psi, between 5,000 psi and 50,000 psi, between 5,000 psi and 40,000 psi, between 5,000 psi and 30,000 psi, between 5,000 psi and 20,000 psi, between 10,000 and 90,000 psi, between 10,000 psi an 80,000 psi, between 10,000 psi and 70,000 psi, between 10,000 psi and 60,000 psi, between 10,000 psi and 50,000 psi, between 10,000 psi and 40,000 psi, between 10,000 psi and 30,000 psi, between 10,000 psi and 20,000 psi.
The rails 300, 302 can have a lengthwise flexural strength that is less than 90,000 psi, less than 80,000 psi, less than 70,000 psi, less than 60,000 psi, less than 50,000 psi, less than 40,000 psi, less than 35,000 psi, less than 30,000 psi, less than 25,000 psi, less than 20,000 psi, less than 15,000 psi, less than 10,000 psi. The rails 300, 302 can have a lengthwise flexural strength that is between 5,000 psi and 90,000 psi, between 5,000 psi an 80,000 psi, between 5,000 psi and 70,000 psi, between 5,000 psi and 60,000 psi, between 5,000 psi and 50,000 psi, between 5,000 psi and 40,000 psi, between 5,000 psi and 30,000 psi, between 5,000 psi and 20,000 psi, between 10,000 and 90,000 psi, between 10,000 psi an 80,000 psi, between 10,000 psi and 70,000 psi, between 10,000 psi and 60,000 psi, between 10,000 psi and 50,000 psi, between 10,000 psi and 40,000 psi, between 10,000 psi and 30,000 psi, between 10,000 psi and 20,000 psi.
The rails 300, 302 can have a crosswise flexural strength that is less than 90,000 psi, less than 80,000 psi, less than 70,000 psi, less than 60,000 psi, less than 50,000 psi, less than 40,000 psi, less than 35,000 psi, less than 30,000 psi, less than 25,000 psi, less than 20,000 psi, less than 15,000 psi, less than 10,000 psi, or less than 5,000 psi. The rails 300, 302 can have a crosswise flexural strength that is between 5,000 psi and 90,000 psi, between 5,000 psi an 80,000 psi, between 5,000 psi and 70,000 psi, between 5,000 psi and 60,000 psi, between 5,000 psi and 50,000 psi, between 5,000 psi and 40,000 psi, between 5,000 psi and 30,000 psi, between 5,000 psi and 20,000 psi, between 10,000 and 90,000 psi, between 10,000 psi an 80,000 psi, between 10,000 psi and 70,000 psi, between 10,000 psi and 60,000 psi, between 10,000 psi and 50,000 psi, between 10,000 psi and 40,000 psi, between 10,000 psi and 30,000 psi, or between 10,000 psi and 20,000 psi.
The rails 300, 302 can have a lengthwise yield strength that is less than 90,000 psi, less than 80,000 psi, less than 70,000 psi, less than 60,000 psi, less than 50,000 psi, less than 40,000 psi, less than 35,000 psi, less than 30,000 psi, less than 25,000 psi, less than 20,000 psi, less than 15,000 psi, less than 10,000 psi. The rails 300, 302 can have a lengthwise yield strength that is between 5,000 psi and 90,000 psi, between 5,000 psi an 80,000 psi, between 5,000 psi and 70,000 psi, between 5,000 psi and 60,000 psi, between 5,000 psi and 50,000 psi, between 5,000 psi and 40,000 psi, between 5,000 psi and 30,000 psi, between 5,000 psi and 20,000 psi, between 10,000 and 90,000 psi, between 10,000 psi an 80,000 psi, between 10,000 psi and 70,000 psi, between 10,000 psi and 60,000 psi, between 10,000 psi and 50,000 psi, between 10,000 psi and 40,000 psi, between 10,000 psi and 30,000 psi, between 10,000 psi and 20,000 psi.
The rails 300, 302 can have a crosswise yield strength that is less than 90,000 psi, less than 80,000 psi, less than 70,000 psi, less than 60,000 psi, less than 50,000 psi, less than 40,000 psi, less than 35,000 psi, less than 30,000 psi, less than 25,000 psi, less than 20,000 psi, less than 15,000 psi, less than 10,000 psi, or less than 5,000 psi. The rails 300, 302 can have an crosswise yield strength that is between 5,000 psi and 90,000 psi, between 5,000 psi an 80,000 psi, between 5,000 psi and 70,000 psi, between 5,000 psi and 60,000 psi, between 5,000 psi and 50,000 psi, between 5,000 psi and 40,000 psi, between 5,000 psi and 30,000 psi, between 5,000 psi and 20,000 psi, between 10,000 and 90,000 psi, between 10,000 psi an 80,000 psi, between 10,000 psi and 70,000 psi, between 10,000 psi and 60,000 psi, between 10,000 psi and 50,000 psi, between 10,000 psi and 40,000 psi, between 10,000 psi and 30,000 psi, between 10,000 psi and 20,000 psi.
Several ASTM standards are available to provide guidance on performing tensile tests and the correct test is easily ascertainable by one skilled in art depending on the material being tested. Three of the most common standards are ASTM E8 for metallic materials, ASTM D3039 for polymer matrix composite materials and ASTM D638 for unreinforced and reinforced plastics. Although there can be many variations on the standard tensile test, a tensile test most often involves loading a test specimen in a universal testing machine and applying an increasing uniaxial load to the specimen until failure occurs. The sample can be supported in the test frame any number of ways: hydraulic grips, mechanically fastened clevis grips or threaded grips. The method of gripping most often depends on the material being tested, its geometry and the capabilities of the test frame.
The rail system 100 can also include one or more longitudinal members or rods 400, 402 that are disposed within any of the longitudinal void spaces 310, 312, 320, 322. The rods 400, 402 can have a crosswise ultimate tensile strength that is at least 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100% greater than the crosswise ultimate tensile strength of the rails 300, 302. The rods 400, 402 can have a lengthwise ultimate tensile strength that is at least 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100% greater than the lengthwise ultimate tensile strength of the rails 300, 302. The rods 400, 402 can have a crosswise yield strength that is at least 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100% greater than the crosswise yield strength of the rails 300, 302. The rods 400, 402 can have a lengthwise yield strength that is at least 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100% greater than the lengthwise yield strength of the rails 300, 302.
The rods 400, 402 can have an ultimate lengthwise tensile strength that is greater than 10,000 psi, greater than 20,000 psi, greater than 25,000 psi, greater than 30,000 psi, greater than 35,000 psi, greater than 40,000 psi, greater than 45,000 psi, greater than 50,000 psi, greater than 55,000 psi, greater than 65,000 psi, greater than 75,000 psi, or greater than 80,000 psi. The rods 400, 402 can have an ultimate lengthwise tensile strength that is between 10,000 psi and 90,000 psi, between 15,000 psi an 80,000 psi, between 20,000 psi and 70,000 psi, between 25,000 psi and 60,000 psi, between 25,000 psi and 70,000 psi, between 25,000 psi and 80,000 psi, between 30,000 psi and 50,000 psi, or between 30,000 psi and 60,000 psi.
The rods 400, 402 can have an ultimate crosswise tensile strength that is greater than 10,000 psi, greater than 20,000 psi, greater than 25,000 psi, greater than 30,000 psi, greater than 35,000 psi, greater than 40,000 psi, greater than 45,000 psi, greater than 50,000 psi, greater than 55,000 psi, greater than 65,000 psi, greater than 75,000 psi, or greater than 80,000 psi. The rods 400, 402 can have an ultimate crosswise tensile strength that is between 10,000 psi and 90,000 psi, between 15,000 psi an 80,000 psi, between 20,000 psi and 70,000 psi, between 25,000 psi and 60,000 psi, between 25,000 psi and 70,000 psi, between 25,000 psi and 80,000 psi, between 30,000 psi and 50,000 psi, or between 30,000 psi and 60,000 psi.
The rods 400, 402 can have a lengthwise flexural strength that is greater than 10,000 psi, greater than 20,000 psi, greater than 25,000 psi, greater than 30,000 psi, greater than 35,000 psi, greater than 40,000 psi, greater than 45,000 psi, greater than 50,000 psi, greater than 55,000 psi, greater than 65,000 psi, greater than 75,000 psi, or greater than 80,000 psi. The rods 400, 402 can have a lengthwise flexural strength that is between 10,000 psi and 90,000 psi, between 15,000 psi an 80,000 psi, between 20,000 psi and 70,000 psi, between 25,000 psi and 60,000 psi, between 25,000 psi and 70,000 psi, between 25,000 psi and 80,000 psi, between 30,000 psi and 50,000 psi, or between 30,000 psi and 60,000 psi.
The rods 400, 402 can have a crosswise flexural strength that is greater than 10,000 psi, greater than 20,000 psi, greater than 25,000 psi, greater than 30,000 psi, greater than 35,000 psi, greater than 40,000 psi, greater than 45,000 psi, greater than 50,000 psi, greater than 55,000 psi, greater than 65,000 psi, greater than 75,000 psi, or greater than 80,000 psi. The rods 400, 402 can have a crosswise flexural strength that is between 10,000 psi and 90,000 psi, between 15,000 psi an 80,000 psi, between 20,000 psi and 70,000 psi, between 25,000 psi and 60,000 psi, between 25,000 psi and 70,000 psi, between 25,000 psi and 80,000 psi, between 30,000 psi and 50,000 psi, or between 30,000 psi and 60,000 psi.
The rods 400, 402 can have a lengthwise yield strength that is greater than 10,000 psi, greater than 20,000 psi, greater than 25,000 psi, greater than 30,000 psi, greater than 35,000 psi, greater than 40,000 psi, greater than 45,000 psi, greater than 50,000 psi, greater than 55,000 psi, greater than 65,000 psi, greater than 75,000 psi, or greater than 80,000 psi. The rods 400, 402 can have a lengthwise yield strength that is between 10,000 psi and 90,000 psi, between 15,000 psi an 80,000 psi, between 20,000 psi and 70,000 psi, between 25,000 psi and 60,000 psi, between 25,000 psi and 70,000 psi, between 25,000 psi and 80,000 psi, between 30,000 psi and 50,000 psi, or between 30,000 psi and 60,000 psi.
The rods 400, 402 can have a crosswise yield strength that is greater than 10,000 psi, greater than 20,000 psi, greater than 25,000 psi, greater than 30,000 psi, greater than 35,000 psi, greater than 40,000 psi, greater than 45,000 psi, greater than 50,000 psi, greater than 55,000 psi, greater than 65,000 psi, greater than 75,000 psi, or greater than 80,000 psi. The rods 400, 402 can have a crosswise yield strength that is between 10,000 psi and 90,000 psi, between 15,000 psi an 80,000 psi, between 20,000 psi and 70,000 psi, between 25,000 psi and 60,000 psi, between 25,000 psi and 70,000 psi, between 25,000 psi and 80,000 psi, between 30,000 psi and 50,000 psi, or between 30,000 psi and 60,000 psi.
The rods 400, 402 can be made from one or more metals, such as one or more stainless steels. Any suitable material, however, can be used to fabricate the rods 400, 402. For example, suitable materials can include, but are not limited to, fiber reinforced plastics, any one or more metals (such as aluminum, steel, stainless steel, brass, nickel), wood, other composite materials (such as ceramics, wood/polymer blends, cloth/polymer blends, etc.), and plastics (such as polyethylene, polypropylene, polystyrene, polyurethane, polyethylethylketone (PEEK), polytetrafluoroethylene (PTFE), polyamide resins (such as nylon 6 (N6), nylon 66 (N66)), polyester resins (such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), PET/PEI copolymer) polynitrile resins (such as polyacrylonitrile (PAN), polymethacrylonitrile, acrylonitrile-styrene copolymers (AS), methacrylonitrile-styrene copolymers, methacrylonitrile-styrene-butadiene copolymers; and acrylonitrile-butadiene-styrene (ABS)), polymethacrylate resins (such as polymethyl methacrylate and polyethylacrylate), cellulose resins (such as cellulose acetate and cellulose acetate butyrate); polyimide resins (such as aromatic polyimides), polycarbonates (PC), elastomers (such as ethylene-propylene rubber (EPR), ethylene propylene-diene monomer rubber (EPDM), styrenic block copolymers (SBC), polyisobutylene (PIB), butyl rubber, neoprene rubber, halobutyl rubber and the like)), and mixtures, blends, or copolymers of any and all of the foregoing materials. Additionally, the rods 400, 402 can be hollow.
A plurality of posts 200 are located about a length of the roadway and a plurality of rails 300 and rods 400 are disposed therebetween to form a continuous guard rail or barrier for the road. In the instance of a vehicle coming in contact with the guardrail system 100, the rails 300 and rods 400 performs similar to a net, catching or deflecting the vehicle. It has been discovered that an excessive force from a vehicle can break and/or separate the rails 300 from the posts 200, the rods 400 help absorb the load of the vehicle thereby providing an improved system for redirecting the vehicle back to the roadway or slowing the vehicle down to a complete stop.
Embodiments of the present disclosure further relate to any one or more of the following paragraphs:
1. A guardrail system for use along a roadway, comprising:
a longitudinal body having one or more longitudinal void spaces formed therein;
at least one substantially vertical post connected at one or both ends of the longitudinal body; and
a longitudinal member disposed within any one of the longitudinal void spaces of the longitudinal body having a crosswise ultimate tensile strength that is at least 20% greater than the crosswise ultimate tensile strength of the longitudinal body.
2. A guardrail system for use along a roadway, comprising:
a first longitudinal body having one or more longitudinal void spaces formed therein;
a second longitudinal body having one or more longitudinal void spaces formed therein;
at least one substantially vertical post connected at one or both ends of the first longitudinal body;
a first longitudinal member disposed within any one of the longitudinal void spaces of the first longitudinal body;
a second longitudinal member disposed within any one of the longitudinal void spaces of the second longitudinal body; and
a splicer that connects to both the first longitudinal member and the second longitudinal member.
3. A guardrail system for use along a roadway, comprising:
a longitudinal body having one or more longitudinal void spaces formed therein;
at least one substantially vertical post that is connected at one or both ends of the longitudinal body and having a channel wherein the longitudinal body is disposed within the channel of the post; and
a longitudinal member disposed within any one of the longitudinal void spaces of the longitudinal body.
4. The system according to any one of paragraphs 1-3, wherein at least one of the longitudinal void spaces is cylindrical in shape.
5. The system according to any one of paragraphs 1-4, wherein the longitudinal member is disposed within the longitudinal void space that is cylindrical in shape.
6. The system according to any one of paragraphs 1-5, wherein the longitudinal member is a hollow stainless-steel rod.
7. The system according to any one of paragraphs 1-6, wherein the longitudinal body comprises fiber reinforced plastic.
8. The system according to any one of paragraphs 1-7, wherein at least one of the longitudinal void spaces is rectangular cuboid in shape.
9. The system according to any one of paragraphs 1-8, wherein the longitudinal void space that is rectangular cuboid in shape is at least half filled with a filler material.
10. The system according to any one of paragraphs 1-9, wherein the filler material comprises expandable polystyrene.
11. The system according to any one of paragraphs 1-10, wherein at least one substantially vertical post is connected to both the first longitudinal body and the second longitudinal body.
12. The system according to any one of paragraphs 1-11, wherein the first longitudinal member and the second longitudinal member both have a crosswise ultimate tensile strength that is at least 20% greater than the crosswise ultimate tensile strength of the second longitudinal body
13. The system according to any one of paragraphs 1-12, wherein the channel is C-shaped.
14. The system according to any one of paragraphs 1-13, wherein at least one substantially vertical post is connected to the longitudinal body through the channel of the post using a fastener.
15. The system according to any one of paragraphs 1-14, wherein the longitudinal member is also connected to the longitudinal body and the substantially vertical post using the fastener.
16. The system according to any one of paragraphs 1-15, wherein the longitudinal member has a crosswise ultimate tensile strength that is at least 20% greater than the crosswise ultimate tensile strength of the longitudinal body.
Certain embodiments and features have been described using a set of numerical upper limits and a set of numerical lower limits. It should be appreciated that ranges including the combination of any two values, e.g., the combination of any lower value with any upper value, the combination of any two lower values, and/or the combination of any two upper values are contemplated unless otherwise indicated. Certain lower limits, upper limits and ranges appear in one or more claims below. All numerical values are “about” or “approximately” the indicated value, and take into account experimental error and variations that would be expected by a person having ordinary skill in the art.
Various terms have been defined above. To the extent a term used in a claim is not defined above, it should be given the broadest definition persons in the pertinent art have given that term as reflected in at least one printed publication or issued patent. Furthermore, all patents, test procedures, and other documents cited in this application are fully incorporated by reference to the extent such disclosure is not inconsistent with this application and for all jurisdictions in which such incorporation is permitted.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
This application claims priority to U.S. Provisional Patent Application having Ser. No. 62/569,290, filed on Oct. 6, 2017, and U.S. patent application having Ser. No. 15/829,674, filed on Dec. 1, 2017, now issued as U.S. Pat. No. 10,208,430, which are both incorporated by reference herein in their entireties.
Number | Name | Date | Kind |
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4666130 | Denman et al. | May 1987 | A |
5028463 | Cahill et al. | Jul 1991 | A |
5261647 | Venegas, Jr. et al. | Nov 1993 | A |
5443324 | Sullivan | Aug 1995 | A |
5876020 | Giavotto | Mar 1999 | A |
6149134 | Bank et al. | Nov 2000 | A |
7445402 | Chen | Nov 2008 | B1 |
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Entry |
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International Search Report and Written Opinion for Int'l Application No. PCT/US2018/053695, dated Nov. 30, 2018. |
Number | Date | Country | |
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20190186079 A1 | Jun 2019 | US |
Number | Date | Country | |
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62569290 | Oct 2017 | US |
Number | Date | Country | |
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Parent | 15829674 | Dec 2017 | US |
Child | 16279682 | US |