Roy J. Mefferd

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Laurens, IA, US

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Patents Grantslast 30 patents

Information Patent Grant
Tube section having slots for sampling
- Patent number 5,372,208
- Issue date Dec 13, 1994
- Gold Star Manufacturing, Inc.
- Roy J. Mefferd
- E21 - EARTH DRILLING MINING
Information Patent Grant
Tube auger sections
- Patent number 4,821,818
- Issue date Apr 18, 1989
- Micro Specialties Co., Inc.
- Roy J. Mefferd
- E21 - EARTH DRILLING MINING
Information Patent Grant
Hydraulic cylinder
- Patent number 4,384,511
- Issue date May 24, 1983
- Roy J. Mefferd
- F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL