Patents by Inventor W. James Hammar
W. James Hammar 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: 5753364Abstract: The present invention provides pressure sensitive adhesives, compositions from which the pressure sensitive adhesives are formed, and articles having therein these pressure sensitive adhesives. The pressure sensitive adhesives, which have a Tg of less than about 20.degree. C., include a poly(.beta.-hydroxyorganoate) or mixture thereof. Preferably, these poly(.beta.-hydroxyorganoate)s include monomeric units of the general formula: ##STR1## wherein a minor amount (preferably no greater than about 20 mole percent) of the monomeric units have an R group containing 1-3 carbon atoms; and a major amount (preferably at least about 80 mole percent) of the monomeric units have an R group containing 4-30 (preferably 4-20) carbon atoms.Type: GrantFiled: January 30, 1997Date of Patent: May 19, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Denise R. Rutherford, W. James Hammar, Gaddam N. Babu
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Patent number: 5614576Abstract: The present invention provides pressure sensitive adhesives, compositions from which the pressure sensitive adhesives are formed, and articles having therein these pressure sensitive adhesives. The pressure sensitive adhesives, which have a Tg of less than about 20.degree. C., include a poly(.beta.-hydroxyorganoate) or mixture thereof. Preferably, these poly(.beta.-hydroxyorganoate)s include monomeric units of the general formula: ##STR1## wherein: a minor amount (preferably no greater than about 20 mole percent) of the monomeric units have an R group containing 1-3 carbon atoms; and a major amount (preferably at least about 80 mole percent) of the monomeric units have an R group containing 4-30 (preferably 4-20) carbon atoms.Type: GrantFiled: April 15, 1996Date of Patent: March 25, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Denise R. Rutherford, W. James Hammar, Gaddam N. Babu
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Patent number: 5461133Abstract: An elastomeric orthodontic device such as a ligature, rotation wedge or force module is made of a composition selected from one or more classes of materials, such that the device has certain physical properties useful for orthodontic treatment and also is resistant to staining by common foods and beverages such as mustard, tea and coffee.Type: GrantFiled: February 22, 1994Date of Patent: October 24, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: W. James Hammar, Miriam D. Nave
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Patent number: 5317074Abstract: An elastomeric orthodonic device such as a ligature, rotation wedge or force module is made of a composition selected from one or more classes of materials, such that the device has certain physical properties useful for orthodontic treatment and also is resistant to staining by common foods and beverages such as mustard, tea and coffee.Type: GrantFiled: February 7, 1991Date of Patent: May 31, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: W. James Hammar, Miriam D. Nave
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Patent number: 5273559Abstract: An abrasive composition and dental articles made from same, the composition including abrasive particles dispersed throughout and entrapped within a polyurea or polyurethane urea matrix which contains soft and hard segments wherein the matrix is made from the polymerization reaction of a polyfunctional amine and a polyfunctional isocyanate. The abrasive dental articles include prophylactic cups and polishing wheels, points and discs.Type: GrantFiled: December 17, 1992Date of Patent: December 28, 1993Assignee: Minnesota Mining and Manufacturing CompanyInventors: W. James Hammar, Richard W. Joos
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Patent number: 4801740Abstract: Polymerizable monomer compounds selected from the group having the formulae: ##STR1## whereinR is hydrogen or methyl;X is fluoro, chloro, bromo, iodo, hydroxyl, perfluoroalkylsulfonoxy of one to three carbon atoms, perfluoroacyloxy of one to three carbon atoms, benzoyloxy, or trichloroacetoxy;Y is trichloroacetyl, perfluoroacyl of the formula ##STR2## trialkylsilyl of the formula [CH.sub.3 (CH.sub.2).sub.m ].sub.3 Si-- or hydrogen,wherein n is zero to six; and m is zero to three, with the proviso that when Y in Formula I or II is hydrogen, X is selected from fluoro, chloro, bromo, iodo in Formulas I and II, and additionally from hydroxyl in Formula I, are disclosed. Polymers and copolymers of the invention are useful for preparing hydrogel processed articles such as contact lenses, and when dissolved in solvents they can be coated onto articles and then hydrolyzed to provide hydrogel coatings.Type: GrantFiled: February 13, 1987Date of Patent: January 31, 1989Assignee: Minnesota Mining and Manufacturing CompanyInventor: W. James Hammar
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Patent number: 4786657Abstract: A crosslinkable polyurethane or polyurethane/polyurea comprises the reaction product of a composition comprising a macrodiol or macrodiamine, 2-gl;yceryl acrylate or 2-glyceryl methacrylate, a diisocyanate, and optionally a small glycol or small diamine as chain extender. The performance properties of the polyurethanes and polyurethane/polyureas can be controlled by adjustment of the crosslink level and/or curing parameters.Type: GrantFiled: July 2, 1987Date of Patent: November 22, 1988Assignee: Minnesota Mining and Manufacturing CompanyInventors: W. James Hammar, John S. Staral
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Patent number: 4786446Abstract: A process for preparing shaped articles and shaped hydrogel articles including ophthalmic devices comprises the steps of preparing a polymer or copolymer comprising units derived from an ethylenically-unsaturated monomer bearing at least one trihaloacetoxy-substituent group, thermoforming said polymer by heating in a mold or in sheet-form at a temperature in the range of 100.degree. to 400.degree. C. for about 5 seconds to 15 minutes, and then cooling said polymer, to provide a shaped article, solvolyzing the resulting shaped article to provide a hydroxy-substituted polymeric shaped article, and optionally hydrating said hydroxy-substituted polymeric shaped article to provide a shaped hydrogel article.Type: GrantFiled: February 26, 1987Date of Patent: November 22, 1988Assignee: Minnesota Mining and Manufacturing CompanyInventors: W. James Hammar, Ronald F. Ofstead
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Patent number: 4673539Abstract: A process for preparing shaped articles and shaped hydrogel articles including ophthalmic devices comprises the steps of preparing a polymer or copolymer comprising units derived from an ethylenically-unsaturated monomer bearing at least one trihaloacetoxy-substituent group, thermoforming said polymer by heating in a mold or in sheet-form at a temperature in the range of 100.degree. to 400.degree. C. for about 5 seconds to 15 minutes, and then cooling said polymer, to provide a shaped article, optionally, solvolyzing the resulting shaped article to provide a hydroxy-substituted polymeric shaped article, and optionally hydrating said hydroxy-substituted polymeric shaped article to provide a shaped hydrogel article.Type: GrantFiled: May 17, 1985Date of Patent: June 16, 1987Assignee: Minnesota Mining and Manufacturing CompanyInventors: W. James Hammar, Ronald F. Ofstead
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Patent number: 4638040Abstract: Polymerizable monomer compounds selected from the group having the formulae: ##STR1## wherein R is hydrogen or methyl;X is fluoro, chloro, bromo, iodo, perfluoroalkylsulfonoxy of one to three carbon atoms, perfluoroacyloxy of one to three carbon atoms, benzoyloxy, or trichloroacetoxy;Y is trichloroacetyl, perfluoroacyl of the formula ##STR2## trialkylsilyl of the formula [CH.sub.3 (CH.sub.2).sub.m ].sub.3 Si--; wherein n is zero to six; and m is zero to three.Polymers and copolymers of the invention are useful for preparing hydrogel processed articles such as ophthalmic devices, and when dissolved in solvents they can be coated onto articles and then hydrolyzed to provide hydrogel coatings.Type: GrantFiled: May 17, 1985Date of Patent: January 20, 1987Assignee: Minnesota Mining and Manufacturing CompanyInventor: W. James Hammar
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Patent number: 4578504Abstract: Polymerizable monomer compounds selected from the group having the formulae: ##STR1## wherein R is hydrogen or methyl;X is fluoro, chloro, bromo, iodo, hydroxyl, perfluoroalkylsulfonoxy of one to three carbon atoms, perfluoroacyloxy of one to three carbon atoms, benzoyloxy, or trichloroacetoxy;Y is trichloroacetyl, perfluoroacyl of the formula ##STR2## trialkylsilyl of the formula [CH.sub.3 (CH.sub.2).sub.m ].sub.3 Si-- or hydrogen,wherein n is zero to six; and m is zero to three, with the proviso that when Y in Formula I or II is hydrogen, X is selected from fluoro, chloro, bromo, iodo in Formulas I and II, and additionally from hydroxyl in Formula I, are disclosed. Polymers and copolymers of the invention are useful for preparing hydrogel processed articles such as contact lenses, and when dissolved in solvents they can be coated onto articles and then hydrolyzed to provide hydrogel coatings.Type: GrantFiled: June 3, 1983Date of Patent: March 25, 1986Assignee: Minnesota Mining and Manufacturing CompanyInventor: W. James Hammar