Polymer coated SERS nanotag

Information

  • Patent Grant
  • 7723100
  • Patent Number
    7,723,100
  • Date Filed
    Friday, January 12, 2007
    17 years ago
  • Date Issued
    Tuesday, May 25, 2010
    14 years ago
Abstract
An encapsulated surface enhanced Raman scattering (SERS) tag. The tag includes a metal core and an encapsulant, typically a glass encapsulant. The encapsulant is further derivatized with a polymer.
Description
TECHNICAL FIELD

The present invention is directed toward a SERS nanotag and more particularly toward a SERS nanotag having a polymer coating.


BACKGROUND OF THE INVENTION

SERS nanotags are glass coated metal nanoparticles that produce a strong Raman scattering signal when excited by visible and near infrared light. SERS nanotags may be used to perform in vivo assays. Native nanotags, however, appear to the body as foreign objects and so will usually be cleared by the body quickly.


The present invention is directed toward overcoming one or more of the problems discussed above.





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1 is a reagent chart concerning PEGylation.





DETAILED DESCRIPTION

I. Introduction


SERS nanotags are glass coated metal nanoparticles that produce a strong Raman scattering signature when excited by visible and near infrared light. They may be used to perform In-Vivo assays where specific physiological regions, cells, tumour, tissues etc. are targeted by the SERS nanotags as a diagnostic label similar to a fluorophore. Native particles will appear to the body as foreign bodies and so will usually be cleared by the body quickly. Coating in vivo diagnostic particles in polymers can reduce the rate at which particles are cleared by the body.


SERS nanotags are glass coated and so can be subsequently coated by a variety of different molecules, using a variety of different attachment methods. Polymers are coated on particles to increase their retention time the body. Typical polymers used are PEGS (polyethylene glycol), Dextrans etc. PEGS used typically need to be greater than 5000 Da. Particles can be further modified by attaching proteins or antibodies specific for selected physiological regions. Indeed the flexibility of glass attachment chemistry means that a combination of polymers and proteins can be employed which will allow the user to optimize site specificity and retention time. Other particles, e.g Quantum Dots, cannot be as easily coated with a variety of polymers. Therefore the SERS nanotags ability to be retained by the circulation system should be greater than that of Quantum Dots and other particles.


REFERENCES



  • Gao et al. (Jul. 18, 2004) Nature Biotechnology “In vivo cancer targeting and imaging with semiconductor quantum dots.”

  • Åkerman et al. (2002) PNAS 99(20):12621 “Nanocrystal targeting in vivo.”

  • Ballou et al. (2004) Bioconjugate Chem. 15:79-86.



II. SERS Nanotags


One embodiment of the present invention includes the use of encapsulated surface enhanced Raman scattering (SERS) tags. These nanoparticles, referred to as SERS nanotags, include a metal nanoparticle, which metal is Raman enhancing; a Raman-active molecule (sometimes referred to as a SERS tag or reporter molecule) attached to, or associated with the surface of the nanoparticle; and an encapsulant, usually SiO2 (glass). The encapsulant surrounds both the metal nanoparticle and the Raman-active molecule. A particle prepared in this fashion has a measurable SERS spectrum. Although the invention is described in terms of SERS nanotags prepared from single nanoparticles, it is to be understood that nanoparticle core clusters or aggregates may be used in the preparation of SERS nanotags. Methods for the preparation of clusters of aggregates of metal colloids are known to those skilled in the art. The use of sandwich-type particles is described in U.S. Pat. No. 6,861,263, which patent is incorporated herein by reference.


SERS data may be obtained from the tags by illuminating the SERS nanotags with a suitable excitation wavelength. In the case of some reporter molecules excitation wavelengths are in the range of about 600-1000 nm. In some embodiments, the excitation wavelengths are 632.8, 785, or 980 nm. Examples of reporter molecules include 4-mercaptopyridine (4-MP); trans-4,4′ bis(pyridyl)ethylene (BPE); quinolinethiol; 4,4′-dipyridyl, 1,4-phenyldiisocyanide; mercaptobenzamidazole; 4-cyanopyridine; 1′,3,3,3′,3′-hexamethylindotricarbocyanine iodide; 3,3′-diethyltiatricarbocyanine; malachite green isothiocyanate; bis-(pyridyl)acetylenes; Bodipy, and isotopes thereof, including, for example, deuterated BPE, deuterated 4,4′-dipyridyl, and deuterated bis-(pyridyl)acetylenes; as well as pyridine, pyridine-d5 (deuterated pyridine), and pyridine-15N. A suitable excitation wavelength is one at which the background noise component, generated by fluorescence from other fuel components is low enough to obtain a detectable SERS signal.


The SERS nanotags may comprise any nanoparticle core known in the art to be Raman-enhancing. As used herein, the term “nanoparticle”, “nanostructure”, “nanocrystal”, “nanotag,” and “nanocomponent” are used interchangeably to refer to a particle, generally a metallic particle, having one dimension in the range of about 1 nm to about 1000 nm. In some embodiments, the metal nanoparticle core is a spherical or nearly spherical particle of 20-200 nm in diameter. In some embodiments the range is about 20 nm to about 50 nm, in some embodiments in the range of about 30 nm to about 100 nm. The tags may be polydisperse. That is, a group of tags may comprise tags with these ranges of diameters, but each tag need not have the same diameter.


Nanoparticles may be isotropic or anisotropic. Anisotropic nanoparticles may have a length and a width. In some embodiments, the length of an anisotropic nanoparticle is the dimension parallel to the aperture in which the nanoparticle was produced. In the case of anisotropic nanoparticles, in some embodiments, the nanoparticle has a diameter (width) of 350 nm or less. In other embodiments, the nanoparticle has a diameter of 250 nm or less and in some embodiments, a diameter of 100 nm or less. In some embodiments, the width is between 15 nm to 300 nm. In some embodiments, the nanoparticle has a length of about 10-350 nm.


Nanoparticles include colloidal metal, hollow or filled nanobars, magnetic, paramagnetic, conductive or insulating nanoparticles, synthetic particles, hydrogels (colloids or bars), and the like. The nanoparticles used in the present invention can exist as single nanoparticles, or as clusters or aggregates of the nanoparticles. Clusters or aggregates may be formed by the addition of aggregating agents to the SERS nanotags.


It will also be appreciated by one of ordinary skill in the art that nanoparticles can exist in a variety of shapes, including but not limited to spheroids, rods, disks, pyramids, cubes, cylinders, nanohelixes, nanosprings, nanorings, rod-shaped nanoparticles, arrow-shaped nanoparticles, teardrop-shaped nanoparticles, tetrapod-shaped nanoparticles, prism-shaped nanoparticles, and a plurality of other geometric and non-geometric shapes. Another class of nanoparticles that has been described include those with internal surface area. These include hollow particles and porous or semi-porous particles. Moreover, it is understood that methods to prepare particles of these shapes, and in certain cases to prepare SERS-active particles of these shapes, have been described in the literature. While it is recognized that particle shape and aspect ratio can affect the physical, optical, and electronic characteristics of nanoparticles, the specific shape, aspect ratio, or presence/absence of internal surface area does not bear on the qualification of a particle as a nanoparticle.


Various systems can be used for detection of SERS nanotags. A number of commercially available instruments may be used. For example, Raman Systems Inc., Enwave Optronics, Inc., Kaiser Optical Systems, Inc., InPhotonics, Inc., J-Y Horiba, Renishaw, Bruker Optics, Thermo Electron, Avalon, GE Ion Track, Delta Nu, Concurrent Analytical, Raman Systems, Inphotonics, ChemImage, Jasco, Lambda Systems, SpectraCode, Savante, Real-Time Analyzers, Veeco, Witec, and other companies provide Raman spectrometers suitable for use in the present invention.


III. Polymer Coated SERS Nanotags


The glass coated SERS nanotags described above can be derivatized with polymers using a variety of methods.


The native glass coat serves at least 2 purposes:

    • Sequester and stabilize the Raman active Tag by encapsulation of the adsorbed tag on the metallic surface.
    • Provide a surface that can be easily modified with a variety of well known attachment chemistries leading to versatile and functional surfaces.


These surfaces are amenable to the development of robust and controllable methods for bioconjugation. Indeed, the surface silanol groups can be easily derivatized with commercially available mercapto-, carboxy-, amino-, aldehydo- and epoxy-silane reagents.


The introduction of the functional groups has been done by 2 alternate routes:

    • Direct derivatization with functional silanes. Only functional silane reagent is reacted directly with glass-coated NBC. This approach was also used for Glass vial derivatization.
    • Derivatization in presence of TEOS. These is a 2-glass layer approach whereby the functional silane is introduced along with a second TEOS treatment.


These functionalization routes provide the flexibility to conjugate practically any type of molecule. This method takes advantage of the large library of functional PEGs provided by Nektar (form. Shearwater) to generate many PEGylated tags. (See FIG. 1 taken from Nektar website www.nektar.com).


PEG may thus provide biocompatibility and extended in-vivo lifetimes of the SERS tags.


To achieve a similar extended bioavailability the tags can alternatively be coated with other molecules such as with proteins, DNA, RNA, synthetic Polyaminoacids (Polylysine, Polyglutamic acid), Polyethylene glycols, block copolymer dendrimers, polyamides, polyethylenimines, polyacrylates and other natural polymers such as Dextrans and other natural carbohydrate based polymers


EXAMPLES

The following examples are provided for illustrative purposes only and are not intended to limit the scope of the invention.


Functionalization of Glass coated SERS tags using the 2 Glass-layer approach:


Materials & Reagents

    • APTMS; Aminopropyltrimethoxysilane was purchased from Aldrich
    • MPTMS Mercaptopropyltrimethoxysilane was purchased from Fluka
    • CEST Carboxyethylsilane triol was purchased from Gelest
    • GPTMS: 3-Glycidoxypropyl)-Trimethoxysilane was from United Chemical Technologies
    • TEOS Tetraethylorthosilicate was purchased from Sigma
    • NH4OH
    • 20×BPE M8.3 Glass coated SERS tags were prepared in-house by Frances Wong


Amino-Tags: APTMS derivatization of Glass coated SERS tags

    • 1. Take 15 ml conical Prolypropylene tube
    • 2. Add 8 mL EtOH
    • 3. Add 2 mL 20× tag
    • 4. Add 0.5 mL NH4OH
    • 5. Add 40 ul solution of 5% APTMS in TEOS
    • 6. Mix on turning wheel for 60 nm at room Temp
    • 7. Centrifuge 40 nm 35000 rpm
    • 8. Wash 2 times with 10 ml DI water
    • 9. Wash 2 times with 1.5 ml DI water
    • 10. Store in 1000 ul water→concentration is 40×


Epoxy-Tags: GPTMS derivatization of Glass coated SERS tags

    • 1. Take 15 ml conical Prolypropylene tube
    • 2. Add 8 mL EtOH
    • 3. Add 2 mL 20× tag
    • 4. Add 0.5 mL NH4OH
    • 5. Add 40 ul solution of 5% GPTMS in TEOS
    • 6. Mix on turning wheel for 60 nm at room Temp
    • 7. Centrifuge 40 nm 35000 rpm
    • 8. Wash 2 times with 10 ml DI water
    • 9. Wash 2 times with 1.5 ml DI water
    • 10. Store in 1000 ul water→concentration is 40×


Thiolated-Tags: MPTMS derivatization of Glass coated SERS tags (this is the protocol for conventional tag preparation)

    • 1. Take 15 ml conical Prolypropylene tube
    • 2. Add 8 mL EtOH
    • 3. Add 2 mL 20× tag
    • 4. Add 0.5 mL NH4OH
    • 5. Add 10 ul solution of 5% MPTMS in TEOS
    • 6. Mix on turning wheel for 60 nm at room Temp
    • 7. Centrifuge 40 nm 35000 rpm
    • 8. Wash 2 times with 10 ml DI water
    • 9. Wash 2 times with 1.5 ml DI water
    • 10. Store in 1000 ul water→concentration is 40×


Carboxy-Tags: CEST derivatization of Glass coated SERS tags

    • 11. Take 15 ml conical Prolypropylene tube
    • 12. Add 8 mL EtOH
    • 13. Add 2 mL 20× tag
    • 14. Add 0.5 mL NH4OH
    • 15. Add 40 ul solution of 5% CEST in TEOS
    • 16. Mix on turning wheel for 60 nm at room Temp
    • 17. Centrifuge 40 nm 35000 rpm
    • 18. Wash 2 times with 10 ml DI water
    • 19. Wash 2 times with 1.5 ml DI water
    • 20. Store in 1000 ul water→concentration is 40×


General Direct derivatization method for functionalization of Glass coated SERS tags

    • 1. Take 15 ml conical Prolypropylene tube
    • 2. Add 8 mL EtOH
    • 3. Add 2 mL 20× tag
    • 4. Add solution of 2% silane/2% water in EtOH (1 ml)
    • 5. Mix on turning wheel for 60 nm at room Temp
    • 6. Centrifuge 40 nm 35000 rpm
    • 7. Add 5 ml Ethanol and place on hot plate (50 C) for 30 nm
    • 8. Wash 2 times with 10 ml DI water
    • 9. Wash 2 times with 1.5 ml DI water
    • 10. Store in 1000 ul water→concentration is 40×


Derivatization of Functional Glass-coated SERS Tags with PEG derivatives


Amino-Tag derivatization with mPEG-SPA, Fluorescein-PEG-NHS & Succinic Anhydride


Materials & Reagents

    • Amino-Tag (via APTMS)
    • Succinic Anhydride from Aldrich
    • mPEG-SPA was from Nektar
    • Fluorescein-PEG-NHS was from Nektar
    • PBS


Amine derivatization with Succinic Anhydride

    • 1. 300 ul (10×) RC121-2A Amino Tags
    • 2. 300 ul Borate buffer
    • 3. Dissolve 0.04 g succinic anhydride in 1 mL DMSO
    • 4. Add 10 uL succinic anhydride solution to Amino Tags. Mix for 20 nm
    • 5. Check pH.
    • 6. Repeat #3 if necessary.
    • 7. Incubate at RT for 2 hrs
    • 8. Wash 2× with H2O using centrifugation
    • 9. Store in 300 ul H2O


Amine derivatization with mPEG-SPA

    • 1. 300 ul (10×) Amino Tags
    • 2. 300 ul PBS
    • 3. Dissolve 0.01 g mPEG-SPA in 1 mL PBS
    • 4. Add 100 uL solution to Amino Tags.
    • 5. Incubate at RT for 2 hrs
    • 6. Wash 2× with H2O using centrifugation
    • 7. Store in 300 ul H2O


Amine derivatization with Fluorescein-PEG-NHS

    • 1. 300 ul (10×) Amino Tags
    • 2. 300 ul PBS
    • 3. Dissolve 0.01 g Fluorescein-PEG-NHS in 1 mL PBS
    • 4. Add 100 uL solution to Amino Tags.
    • 5. Incubate at RT for 2 hrs
    • 6. Wash 2× with H2O using centrifugation
    • 7. Store in 300 ul H2O


Epoxy-Tag derivatization with mPEG-NH2 & NH2-PEG-Carboxylate


Materials & Reagents

    • Epoxy-Tag (via (3-Glycidoxypropyl)-Trimethoxysilane. United Chemical Technologies)
    • mPEG-NH2 was from Nektar
    • NH2-PEG-Carboxylate was from Nektar
    • Borate buffer


Epoxide reaction with mPEG-NH2

    • 1. 300 ul (10×) Epoxy-Tag
    • 2. 300 ul Borate buffer
    • 3. Dissolve 0.01 g mPEG-NH2 in 1 mL Borate buffer
    • 4. Add 100 uL mPEG-NH2 solution to Epoxy-Tags
    • 5. Incubate at RT for 60 nm
    • 6. Wash 2× with H2O using centrifugation
    • 7. Store in 300 ul H2O


Epoxide Reaction with NH2-PEG-Carboxylate

    • 1. 300 ul (10×) Epoxy-Tag
    • 2. 300 ul Borate buffer
    • 3. Dissolve 0.01 g NH2-PEG-Carboxylate in 1 mL Borate buffer.
    • 4. Add 100 uL g NH2-PEG-Carboxylate solution to Epoxy-Tags
    • 5. Incubate at RT for 60 nm
    • 6. Wash 2× with H2O using centrifugation
    • 7. Store in 300 ul H2O


Thiolated-Tag derivatization with Maleimido-mPEGs


Materials & Reagents

    • Thiolated-Tag, 40× in Di water
    • mPEG-MAL-5,000 is from Nektar
    • mPEG-MAL-20,000 is from Nektar


Thiol reaction with Maleimido-mPEG-5,000

    • 1. Thiolated-Tag is resuspended in PBS w/o Calcium and Magnesium chloride at a concentration of 40× (1 mL)
    • 2. Prepare mPEG-MAL-5000 at 10 mg/ml in the same buffer
    • 3. Add 200 uL mPEG-MAL-5000 solution to Thiolated-Tags
    • 4. Incubate at RT for 3 hrs
    • 5. Wash 2× with 1 mL H2O using centrifugation
    • 6. Wash 2× with 1 mL PBS w/o Calcium and Magnesium chloride using centrifugation
    • 7. Wash 2× with 1 mL PBS with Calcium and Magnesium chloride using centrifugation
    • 8. Store in 1 mL PBS with Calcium and Magnesium chloride at 40×


Thiol reaction with Maleimido-mPEG-20,000

    • 1. Thiolated-Tag is resuspended in PBS w/o Calcium and Magnesium chloride at a concentration of 40× (1 mL)
    • 2. Prepare mPEG-MAL-20,000 at 10 mg/ml in the same buffer
    • 3. Add 200 uL mPEG-MAL-20,000 solution to Thiolated-Tags
    • 4. Incubate at RT for 3 hrs
    • 5. Wash 2× with 1 mL H2O using centrifugation
    • 6. Wash 2× with 1 mL PBS w/o Calcium and Magnesium chloride using centrifugation
    • 7. Wash 2× with 1 mL PBS with Calcium and Magnesium chloride using centrifugation
    • 8. Store in 1 mL PBS with Calcium and Magnesium chloride at 40×


While the invention has been particularly shown and described with reference to a number of embodiments, it would be understood by those skilled in the art that changes in the form and details may be made to the various embodiments disclosed herein without departing from the spirit and scope of the invention and that the various embodiments disclosed herein are not intended to act as limitations on the scope of the claims.

Claims
  • 1. A coated nanotag comprising: a SERS-active nanotag; and a polymer coating completely covering the SERS active nanotag, wherein the SERS-active nanotag comprises: a core comprising one or more nanoparticles, a Raman-active molecule attached to or associated with the core, and an encapsulant.
  • 2. The coated nanotag according to claim 1, wherein the core comprises a single nanoparticle.
  • 3. The coated nanotag according to claim 1, wherein the core comprises a plurality of nanoparticles.
  • 4. The coated nanotag according to claim 1, wherein the encapsulant comprises glass.
  • 5. The coated nanotag according to claim 1, wherein the polymer comprises polyethylene glycol.
  • 6. The coated nanotag according to claim 1, wherein the polymer comprises one or more polymers selected from the group consisting of polyethylene glycol, synthetic polyaminoacids, block copolymer dendrimers, polyamides, polyethylenimines, polyacrylates, and natural carbohydrates.
  • 7. The coated nanotag according to claim 1, wherein the coated nanotag has a longer in vivo retention time as compared to an identical nanotag without the polymer coating.
RELATED APPLICATION

This application claims priority from U.S. Provisional Application Ser. No. 60/758,873, filed on Jan. 13, 2006, entitled “Polymer Coated SERS Nanotag”, the contents of which are incorporated herein in their entirety.

US Referenced Citations (89)
Number Name Date Kind
3975084 Block Aug 1976 A
4039297 Takenaka Aug 1977 A
4313734 Leuvering Feb 1982 A
4802761 Bowen et al. Feb 1989 A
4853335 Olsen et al. Aug 1989 A
4920059 Moeremans et al. Apr 1990 A
5023139 Birnboim et al. Jun 1991 A
5059394 Phillips et al. Oct 1991 A
5096809 Chen et al. Mar 1992 A
5112127 Carrabba et al. May 1992 A
5137827 Mroczkowski et al. Aug 1992 A
5255067 Carrabba et al. Oct 1993 A
5266498 Tarcha et al. Nov 1993 A
5384265 Kidwell et al. Jan 1995 A
5441894 Coleman et al. Aug 1995 A
5445972 Tarcha et al. Aug 1995 A
5552086 Siiman et al. Sep 1996 A
5567628 Tarcha et al. Oct 1996 A
5580492 Bonnemann et al. Dec 1996 A
5609907 Natan Mar 1997 A
5637508 Kidwell et al. Jun 1997 A
5674699 Saunders et al. Oct 1997 A
5828450 Dou et al. Oct 1998 A
5825790 Lawandy Nov 1998 A
5833924 McClintock et al. Nov 1998 A
5864397 Vo-Dinh Jan 1999 A
5891738 Soini et al. Apr 1999 A
5935755 Kazmaier et al. Aug 1999 A
5958704 Starzl et al. Sep 1999 A
6020207 Liu Feb 2000 A
6027890 Ness et al. Feb 2000 A
6103868 Heath et al. Aug 2000 A
6136610 Polito et al. Oct 2000 A
6149868 Natan et al. Nov 2000 A
6200820 Hansen et al. Mar 2001 B1
6219137 Vo-Dinh Apr 2001 B1
6235241 Catt et al. May 2001 B1
6274323 Bruchez et al. Aug 2001 B1
6344272 Oldenburg et al. Feb 2002 B1
6361944 Mirkin et al. Mar 2002 B1
6422998 Vo-Dinh et al. Jul 2002 B1
6436651 Everhart et al. Aug 2002 B1
6451619 Catt et al. Sep 2002 B1
6500622 Bruchez, Jr. et al. Dec 2002 B2
6514767 Natan Feb 2003 B1
6514770 Sorin Feb 2003 B1
6558956 Carron et al. May 2003 B1
6562403 Klabunde et al. May 2003 B2
6587197 Rahbar-Dehghan Jul 2003 B1
6595427 Soni et al. Jul 2003 B1
6603537 Dietz et al. Aug 2003 B1
6610351 Shchegolikhin et al. Aug 2003 B2
6630307 Bruchez et al. Oct 2003 B2
6642012 Ashdown Nov 2003 B1
6646738 Roe Nov 2003 B2
6649138 Adams et al. Nov 2003 B2
6653080 Bruchez et al. Nov 2003 B2
6682596 Zehnder et al. Jan 2004 B2
6687395 Dietz et al. Feb 2004 B1
6699724 West et al. Mar 2004 B1
6730400 Komatsu et al. May 2004 B1
6743581 Vo-Dinh Jun 2004 B1
6750016 Mirkin et al. Jun 2004 B2
6750031 Ligler et al. Jun 2004 B1
6759235 Empedocles et al. Jul 2004 B2
6778316 Halas et al. Aug 2004 B2
6815064 Treadway et al. Nov 2004 B2
6815212 Ness et al. Nov 2004 B2
6838243 Lai et al. Jan 2005 B2
6861263 Natan Mar 2005 B2
6919009 Stonas et al. Jul 2005 B2
6970246 Hansen Nov 2005 B2
6972173 Su et al. Dec 2005 B2
7045049 Natan et al. May 2006 B1
7079241 Empedocles et al. Jul 2006 B2
7098041 Kaylor et al. Aug 2006 B2
7102747 Wang et al. Sep 2006 B2
7102752 Kaylor et al. Sep 2006 B2
7105310 Gray et al. Sep 2006 B1
7122384 Prober et al. Oct 2006 B2
7123359 Armstrong et al. Oct 2006 B2
7141212 Catt et al. Nov 2006 B2
7192778 Natan Mar 2007 B2
7443489 Natan Oct 2008 B2
20020142480 Natan Oct 2002 A1
20030232388 Kreimer et al. Dec 2003 A1
20050036148 Phelan Feb 2005 A1
20050037510 Sharrock et al. Feb 2005 A1
20050037511 Sharrock Feb 2005 A1
Foreign Referenced Citations (22)
Number Date Country
0 653 625 May 1995 EP
0 703 454 Mar 1996 EP
1 181 091 Feb 2002 EP
WO 8807680 Oct 1988 WO
WO 9217781 Oct 1992 WO
WO 9804740 Feb 1998 WO
WO 9810289 Mar 1998 WO
WO 9921934 May 1999 WO
WO 0011024 Mar 2000 WO
WO 0027645 May 2000 WO
WO 0108081 Feb 2001 WO
WO 0125002 Apr 2001 WO
WO 0125510 Apr 2001 WO
WO 0125758 Apr 2001 WO
WO 0229136 Apr 2002 WO
WO 02068932 Jun 2002 WO
WO 02079764 Oct 2002 WO
WO 03021231 Mar 2003 WO
WO 03021853 Mar 2003 WO
WO 2006036130 Apr 2006 WO
WO 2006042111 Apr 2006 WO
WO 2006105110 Oct 2006 WO
Related Publications (1)
Number Date Country
20070165219 A1 Jul 2007 US
Provisional Applications (1)
Number Date Country
60758873 Jan 2006 US