Patents by Inventor Robert Edward Burrell
Robert Edward Burrell 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: 6333093Abstract: Multilayer anti-microbial materials formed to produce an interference colour, and thus an indictor of anti-microbial effect, are provided. The materials include a partly reflective base layer and a partly reflective, partly transmissive top layer balanced to produce an interference colour. The top layer is formed from an anti-microbial metal with atomic disorder. Dissolution or a change in composition of the top layer on contacting an alcohol or electrolyte causes a change in optical path length so as to produce a change in the interference colour of the material. Multilayer, laminated wound dressings are also provided. The dressing includes a first and second layer, and preferably a third layer. The first and third layers are formed of perforated, non-adherent materials and most preferably carry an anti-microbial coating as above. The second layer is sandwiched between the first and third layers and is formed of an absorbent material. At least one of the layers is formed from a plastic material.Type: GrantFiled: March 17, 1997Date of Patent: December 25, 2001Assignee: Westaim Biomedical Corp.Inventors: Robert Edward Burrell, Roderick John Precht
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Patent number: 6238686Abstract: Anti-microbial coatings and method of forming same on medical devices are provided. The coatings are formed by depositing a biocompatible metal by vapour deposition techniques to produce atomic disorder in the coating such that a sustained release of metal ions sufficient to produce an anti-microbial effect is achieved. Preferred deposition conditions to achieve atomic disorder include a lower than normal substrate temperature, and one or more of a higher than normal working gas pressure and lower than normal angle of incidence of coating flux. Anti-microbial powders formed by mechanical working to produce atomic disorder are also provided. The invention extends to other metal coating and powders similarly formed so as to provide enhanced solubility.Type: GrantFiled: June 25, 1997Date of Patent: May 29, 2001Assignee: Westaim TechnologiesInventors: Robert Edward Burrell, Larry Roy Morris
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Patent number: 6080490Abstract: An actively antimicrobial surface for a substrate and for use in a biologically dynamic environment, such as for treating and preventing microbial infections, including a film consisting of at least an antimicrobial element and another electrochemically nobler element and which forms multitudinous galvanic cells with electrolyte-containing biological fluids, such as body fluids from wounds, etc., for releasing the antimicrobial element at the surface.Type: GrantFiled: November 3, 1997Date of Patent: June 27, 2000Assignee: Westaim Technologies Inc.Inventors: Robert Edward Burrell, Aron Marcus Rosenfeld
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Patent number: 6017553Abstract: Anti-microbial coatings and method of forming same on medical devices are provided. The coatings are preferably formed by depositing an anti-microbial, biocompatible metal by vapor deposition techniques to produce atomic disorder in the coating such that a sustained release of metal ions sufficient to produce an anti-microbial effect is achieved. Preferred deposition conditions to achieve atomic disorder include a lower than normal substrate temperature, and one or more of a higher than normal working gas pressure and a lower than normal angle of incidence of coating flux. Anti-microbial powders formed by vapor deposition or altered by mechanical working to produce atomic disorder are also provided. Novel anti-microbial silver materials are defined, characterized by having a positive rest potential, a T.sub.rec /T.sub.m less than 0.33, and a grain size less than 200 nm.Type: GrantFiled: June 2, 1995Date of Patent: January 25, 2000Assignee: Westaim Technologies, Inc.Inventors: Robert Edward Burrell, Larry Roy Morris, Prasad Shrikrishna Apte, Sudhindra Bharat Sant, Kashmir Singh Gill
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Patent number: 5985308Abstract: Production of an anti-microbial effect in an alcohol or water based electrolyte is achieved by preparing silver materials that form complex ions other than Ag.sup.+, Ag.sup.2+, or Ag.sup.3+, and which produce an anti-microbial effect that is greater than that produced by an equivalent amount of silver as Ag.sup.+. Exemplary complex silver ions produced include Ag(CN).sub.2.sup.-, AgCN(.sub.aq)(ion pair), Ag(NH.sub.3).sub.2.sup.+, AgCl.sub.2.sup.-, Ag(OH).sub.2.sup.-, Ag.sub.2 (OH).sub.3.sup.-, Ag.sub.3 (OH).sub.4.sup.-, and Ag(S.sub.2 O.sub.3).sub.2.sup.3-. The silver materials may be prepared as powders or as solutions or suspensions containing the complex silver ions. The silver materials might also be prepared as coatings, foils, powders, or fine grain or nanocrystalline powders, which are formed with atomic disorder to provide sustained release of the complex silver ions.Type: GrantFiled: February 2, 1994Date of Patent: November 16, 1999Assignee: Westaim Technologies, Inc.Inventors: Robert Edward Burrell, Prasad Shrikrishna Apte, Kashmir Singh Gill, Roderick John Precht, Larry Roy Morris
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Patent number: 5958440Abstract: Anti-microbial coatings and method of forming same on medical devices are provided. The coatings are preferably formed by depositing an anti-microbial, biocompatible metal by vapour deposition techniques to produce atomic disorder in the coating such that a sustained release of metal ions sufficient to produce an anti-microbial effect is achieved. Preferred deposition conditions to achieve atomic disorder include a lower than normal substrate temperature, and one or more of a higher than normal working gas pressure and a lower than normal angle of incidence of coating flux. Anti-microbial powders formed by vapour deposition or altered by mechanical working to produce atomic disorder are also provided. Novel anti-microbial silver materials are defined, characterized by having a positive rest potential, a T.sub.rec /T.sub.m less than 0.33, and a grain size less than 200 nm.Type: GrantFiled: November 18, 1993Date of Patent: September 28, 1999Assignee: Westaim Technologies, Inc.Inventors: Robert Edward Burrell, Larry Roy Morris, Prasad Shrikrishna Apte, Sudhindra Bharat Sant, Kashmir Singh Gill
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Patent number: 5837275Abstract: Anti-microbial coatings and method of forming same on medical devices are provided. The coatings are preferably formed by depositing an anti-microbial, biocompatible metal by vapor deposition techniques to produce atomic disorder in the coating such that a sustained release of metal ions sufficient to produce an anti-microbial effect is achieved. Preferred deposition conditions to achieve atomic disorder include a lower than normal substrate temperature, and one or more of a higher than normal working gas pressure and a lower than normal angle of incidence of coating flux. Anti-microbial powders formed by vapor deposition or altered by mechanical working to produce atomic disorder are also provided. Novel anti-microbial silver materials are defined, characterized by having a positive rest potential, a T.sub.rec /T.sub.m less than 0.33, and a grain size less than 200 nm.Type: GrantFiled: June 2, 1995Date of Patent: November 17, 1998Assignee: Westaim Technologies, Inc.Inventors: Robert Edward Burrell, Larry Roy Morris, Prasad Shrikrishna Apte, Sudhindra Bharat Sant, Kashmir Singh Gill
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Patent number: 5753251Abstract: Anti-microbial coatings and method of forming same on medical devices are provided. The coatings are formed by depositing a biocompatible metal by vapor deposition techniques to produce atomic disorder in the coating such that a sustained release of metal ions sufficient to produce an anti-microbial effect is achieved. Preferred deposition conditions to achieve atomic disorder include a lower than normal substrate temperature, and one or more of a higher than normal working gas pressure and a lower than normal angle of incidence of coating flux. Anti-microbial powders formed by mechanical working to produce atomic disorder are also provided. The invention extends to other metal coatings and powders similarly formed so as to provide enhanced solubility.Type: GrantFiled: June 2, 1995Date of Patent: May 19, 1998Assignee: Westaim Technologies, Inc.Inventors: Robert Edward Burrell, Larry Roy Morris
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Patent number: 5695857Abstract: An actively antimicrobial surface for a substrate and for use in a biologically dynamic environment, such as for treating and preventing microbial infections, comprises a film consisting of at least an antimicrobial element and another electrochemically nobler element and which forms multitudinous galvanic cells with electrolyte containing biological fluids, such as body fluids from wounds, etc., for releasing the antimicrobial element at the surface.Type: GrantFiled: August 23, 1993Date of Patent: December 9, 1997Assignee: Westaim Technologies Inc.Inventors: Robert Edward Burrell, Aron Marcus Rosenfeld, Timothy J. N. Smith
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Patent number: 5681575Abstract: Anti-microbial coatings and method of forming same on medical devices are provided. The coatings are formed by depositing a biocompatible metal by vapor deposition techniques to produce atomic disorder in the coating such that a sustained release of metal ions sufficient to produce an anti-microbial effect is achieved. Preferred deposition conditions to achieve atomic disorder include a lower than normal substrate temperature, and one or more of a higher than normal working gas pressure and a lower than normal angle of incidence of coating flux. Anti-microbial powders formed by mechanical working to produce atomic disorder are also provided. The invention extends to other metal coatings and powders similarly formed so as to provide enhanced solubility.Type: GrantFiled: May 7, 1993Date of Patent: October 28, 1997Assignee: Westaim Technologies Inc.Inventors: Robert Edward Burrell, Larry Roy Morris
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Patent number: 5662824Abstract: Magnetically attractable particles comprise a core of magnetic material encapsulated in a metal oxide coating. They may be made by emulsifying an aqueous solution or dispersion of the magnetic material or precursor, and an aqueous solution or sol of a coating inorganic oxide or precursor, in an inert water-immiscible liquid. The aqueous droplets are gelled, e.g. by ammonia or an amine, recovered, and heated at 250.degree.-2000.degree. C. The resulting particles are generally smooth spheres below 100 microns in diameter and often of sub-micron size.Type: GrantFiled: November 29, 1994Date of Patent: September 2, 1997Assignee: Alfa Biotech SpAInventors: Jean Victor Sang, Paul Groves, Robert Edward Burrell, Gerard Flynn