Patents by Inventor Gary R. Pickrell
Gary R. Pickrell has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7632440Abstract: Porous polymers are made by adding biologically active agent and growth substrates (e.g., yeast and sugar, preferably in the presence of water or other suitable fluid) to a polymer forming material, which may be a liquid. The yeast acts on the sugar, forming carbon dioxide gas bubbles. The material is then polymerized so that the gas bubbles create permanent pores within the polymeric material. The polymer can be an epoxy for example. The pores will contain residue of the yeast. Also, porous metals can be made by combining a metal powder with yeast, sugar, and water. The porous metal paste is then sintered. Porous ceramics and semiconductors can be made by combining the yeast and sugar with a ceramic forming liquid such as polysilazane. Polysilazane converts to silica when heated, which helps to bind the ceramic or semiconductor powder particles at a reduced temperature. Biological agents other than yeast (e.g. bacteria, enzymes), and growth substrates other than sugar can also be used.Type: GrantFiled: September 12, 2006Date of Patent: December 15, 2009Assignee: Virginia Tech Intellectual Properties, Inc.Inventor: Gary R. Pickrell
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Patent number: 7157115Abstract: Porous polymers are made by adding biologically active agent and growth substrates (e.g., yeast and sugar, preferably in the presence of water or other suitable fluid) to a polymer forming material, which may be a liquid. The yeast acts on the sugar, forming carbon dioxide gas bubbles. The material is then polymerized so that the gas bubbles create permanent pores within the polymeric material. The polymer can be an epoxy for example. The pores will contain residue of the yeast. Also, porous metals can be made by combining a metal powder with yeast, sugar, and water. The porous metal paste is then sintered. Porous ceramics and semiconductors can be made by combining the yeast and sugar with a ceramic forming liquid such as polysilazane. Polysilazane converts to silica when heated, which helps to bind the ceramic or semiconductor powder particles at a reduced temperature. Biological agents other than yeast (e.g. bacteria, enzymes), and growth substrates other than sugar can also be used.Type: GrantFiled: July 7, 2004Date of Patent: January 2, 2007Assignee: Virginia Tech Intellectual Properties, Inc.Inventor: Gary R. Pickrell
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Patent number: 6773825Abstract: An improved porous article and a method for forming such porous article are provided. A mixture of ceramic or articles and pliable organic hollow spheres is prepared in a liquid typically as a suspension. The article is formed by pressing, slip casting, extruding or injection molding the mixture. The article is dried to remove the liquid, and then is fired so that the particles are bonded such as by sintering, and the organic spheres are eliminated, resulting in a strong porous article having uniformly spaced interconnected voids.Type: GrantFiled: May 23, 2003Date of Patent: August 10, 2004Assignee: Porvair CorporationInventors: Gary R. Pickrell, Kenneth R. Butcher, Chi Li Lin
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Publication number: 20040110022Abstract: An improved porous article and a method for forming such porous article are provided. A mixture of ceramic or metal particles and pliable organic hollow spheres is prepared in a liquid, typically as a suspension. The article is formed by pressing, slip casting, extruding or injection molding the mixture. The article is dried to remove the liquid, and then is fired so that the particles are bonded such as by sintering, and the organic spheres are eliminated, resulting in a strong porous article having uniformly spaced interconnected voids.Type: ApplicationFiled: May 23, 2003Publication date: June 10, 2004Applicant: Porvair CorporationInventors: Gary R. Pickrell, Kenneth R. Butcher, Chi Li Lin
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Publication number: 20040047536Abstract: Viscous flow and volume consolidation which may cause sensor output drift are avoided in a fiber optic sensor by using a body of crystalline and preferably monocrystalline material to establish the transducer gap. Use of a monocrystalline material also reduces chemical reactivity of the sensor with substances which may be present where the sensor is deployed. The increased dimensional stability of the monocrystalline body in a tube-based, V-groove-based or other type of fiber optic sensor reduces the need for and frequency of recalibration.Type: ApplicationFiled: September 4, 2003Publication date: March 11, 2004Inventors: Gary R. Pickrell, Anbo Wang
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Patent number: 6592787Abstract: An improved porous article and a method for forming such porous article are provided. A mixture of ceramic or metal particles and pliable organic hollow spheres is prepared in a liquid, typically as a suspension. The article is formed by pressing, slip casting, extruding or injection molding the mixture. The article is dried to remove the liquid, and then is fired so that the particles are bonded such as by sintering, and the organic spheres are eliminated, resulting in a strong porous article having uniformly spaced interconnected voids.Type: GrantFiled: March 7, 2001Date of Patent: July 15, 2003Assignee: Porvair CorporationInventors: Gary R. Pickrell, Kenneth R. Butcher, Chi Li Lin
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Publication number: 20010046608Abstract: An improved porous article and a method for forming such porous article are provided. A mixture of ceramic or metal particles and pliable organic hollow spheres is prepared in a liquid, typically as a suspension. The article is formed by pressing, slip casting, extruding or injection molding the mixture. The article is dried to remove the liquid, and then is fired so that the particles are bonded such as by sintering, and the organic spheres are eliminated, resulting in a strong porous article having uniformly spaced interconnected voids.Type: ApplicationFiled: March 7, 2001Publication date: November 29, 2001Inventors: Gary R. Pickrell, Kenneth R. Butcher, Chi Li Lin
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Patent number: 6235665Abstract: An improved porous ceramic article and a method for forming such porous ceramic article. A mixture of ceramic particles and pliable organic hollow spheres is prepared in a liquid, typically as a suspension. The article is formed by pressing, slip casting, extruding or injection molding the mixture. The article is dried to remove the liquid, and then is fired so that the ceramic particles are bonded such as by sintering, and the organic spheres are burned off, resulting in a strong porous ceramic article having uniformly spaced interconnected voids.Type: GrantFiled: August 11, 1999Date of Patent: May 22, 2001Assignee: Porvair CorporationInventors: Gary R. Pickrell, Kenneth R. Butcher
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Patent number: 6210612Abstract: An improved porous ceramic article and a method for forming such porous ceramic article. A mixture of ceramic particles and pliable organic hollow spheres is prepared in a liquid, typically as a suspension. The article is formed by pressing, slip casting, extruding or injection molding the mixture. The article is dried to remove the liquid, and then is fired so that the ceramic particles are bonded such as by sintering, and the organic spheres are burned off, resulting in a strong porous ceramic article having uniformly spaced interconnected voids.Type: GrantFiled: March 31, 1997Date of Patent: April 3, 2001Assignee: Pouvair CorporationInventors: Gary R. Pickrell, Kenneth R. Butcher
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Patent number: 5656541Abstract: The present invention relates to a solid low temperature phosphorus diffusion source that is an R.sub.2 O.sub.3 /P.sub.2 O.sub.5 compound in which the ratio of R.sub.2 O.sub.3 to P.sub.2 O.sub.5 is 1 to 5 and R is Nd, Eu, Pr, Sm, Ho, Tb, Er, Yb, Tm or Dy. The invention also relates to a method of making the diffusion source, a method of using the diffusion source to evolve P.sub.2 O.sub.5 to dope a silicon wafer, and the doped silicon wafer.Type: GrantFiled: July 5, 1995Date of Patent: August 12, 1997Assignee: Techneglas, Inc.Inventors: James E. Rapp, Gary R. Pickrell
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Patent number: 5629234Abstract: The present invention relates to a solid high temperature phosphorus diffusion source that is an R.sub.2 O.sub.3 /P.sub.2 O.sub.5 compound in which the ratio of R.sub.2 O.sub.3 to P.sub.2 O.sub.5 is 1 to 3 and R is La, Y, Ce, Nd, Eu, Pr, Sm, Ho, Tb, Er, Yb, Tm or Dy. The invention also relates to a method of making the diffusion source, a method of using the diffusion source to evolve P.sub.2 O.sub.5 to dope a silicon wafer, and to the doped silicon wafer.Type: GrantFiled: October 19, 1995Date of Patent: May 13, 1997Assignee: Techneglas, Inc.Inventors: Gary R. Pickrell, James E. Rapp
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Patent number: 5350461Abstract: The present invention relates to a solid low temperature phosphorus diffusion source that is an R.sub.2 O.sub.3 /P.sub.2 O.sub.5 compound in which the ratio of R.sub.2 O.sub.3 to P.sub.2 O.sub.5 is 1 to 5 and R is Nd, Eu, Pr, Sm, Ho, Tb, Er, Yb, Tm or Dy. The invention also relates to a method of making the diffusion source, a method of using the diffusion source to evolve P.sub.2 O.sub.5 to dope a silicon wafer, and the doped silicon wafer.Type: GrantFiled: December 8, 1992Date of Patent: September 27, 1994Assignee: Techneglas, Inc.Inventors: Gary R. Pickrell, James E. Rapp
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Patent number: 5350460Abstract: The present invention relates to a solid high temperature phosphorus diffusion source that is an R.sub.2 O.sub.3 /P.sub.2 O.sub.5 compound in which the ratio of R.sub.2 O.sub.3 to P.sub.2 O.sub.5 is 1 to 3 and R is La, Y, Ce, Nd, Eu, Pt, Sm, Ho, Tb, Er, Yb, Tm or Dy. The invention also relates to a method of making the diffusion source, a method of using the diffusion source to evolve P.sub.2 O.sub.5 to dope a silicon wafer, and to the doped silicon wafer.Type: GrantFiled: December 8, 1992Date of Patent: September 27, 1994Assignee: Techneglas, Inc.Inventors: Gary R. Pickrell, James E. Rapp
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Patent number: 4846902Abstract: A doping composition having a high rate of P.sub.2 O.sub.5 evolution as indicated by a thick deposited glassy film of about 1500-2000 angstroms at a doping temperature of only 900.degree. C. for one hour, the composition comprising a gadolinium oxide/P.sub.2 O.sub.5 compound.Type: GrantFiled: May 19, 1988Date of Patent: July 11, 1989Assignee: Owens-Illinois Television Products Inc.Inventor: Gary R. Pickrell