Patents by Inventor Gary J. Drtina
Gary J. Drtina 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: 6018009Abstract: Insoluble supports are prepared which possess high surface areas and efficiently dispersed isocyanate groups. These reactive supports are useful for covalently binding proteins which preferably are enzymes and provide catalysts for conducting organic reactions.Type: GrantFiled: December 23, 1996Date of Patent: January 25, 2000Assignee: 3M Innovative Properties CompanyInventors: Steven M. Heilmann, Gary J. Drtina, Louis C. Haddad, Frederick W. Hyde, Dean M. Moren, Robert A. Pranis
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Patent number: 5760152Abstract: Insoluble supports are prepared which possess high surface areas and efficiently dispersed isocyanate groups. These reactive supports are useful for covalently binding proteins which preferably are enzymes and provide catalysts for conducting organic reactions.Type: GrantFiled: May 30, 1995Date of Patent: June 2, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Steven M. Heilmann, Gary J. Drtina, Louis C. Haddad, Frederick W. Hyde, Dean M. Moren, Robert A. Pranis
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Patent number: 5679779Abstract: Insoluble supports are prepared which possess high surface areas and efficiently dispersed isocyanate groups. These reactive supports are useful for covalently binding proteins which preferably are enzymes and provide catalysts for conducting organic reactions.Type: GrantFiled: May 23, 1995Date of Patent: October 21, 1997Assignee: Minnesota Mining and ManufacturingInventors: Steven M. Heilmann, Gary J. Drtina, Louis C. Haddad, Frederick W. Hyde, Dean M. Moren, Robert A. Pranis
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Patent number: 5614105Abstract: Insolubilized enzyme particulates are located on the upstream surface of a filtration layer of a filtering element which can be used in a cartridge filter. Employed in a recycling flow reaction system at relatively high flux rates, the cartridges are useful for conducting catalyzed chemical reactions of dissolved solutes, for example, esterifications, isomerizations, oxidations, reductions, and cyclizations.Type: GrantFiled: April 20, 1995Date of Patent: March 25, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Steven M. Heilmann, Gary J. Drtina, Philip D. Eitzman, Louis C. Haddad, Frederick W. Hyde, Todd W. Johnson
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Patent number: 5478466Abstract: Insolubilized enzyme particulates are located on the upstream surface of a filtration layer of a filtering element which can be used in a cartridge filter. Employed in a recycling flow reaction system at relatively high flux rates, the cartridges are useful for conducting catalyzed chemical reactions of dissolved solutes, for example, esterifications, isomerizations, oxidations, reductions, and cyclizations.Type: GrantFiled: April 21, 1995Date of Patent: December 26, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Steven M. Heilmann, Gary J. Drtina, Philip D. Eitzman, Louis C. Haddad, Frederick W. Hyde, Todd W. Johnson
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Patent number: 5468847Abstract: The invention provides a method of separating a biomacromolecule which comprises the steps of providing a separation system including a filter element which comprises a composite filtration medium, the composite filtration medium comprising a filtration layer on the upstream surface of which are located insoluble stationary phase particulates, the particulates being capable of binding to a biomacromolecule or class of biomacromolecules, a reservoir containing a solution mixture comprising at least one biomacromolecule as solute, and a pump and associated tubing to form a closed loop assembly, and recirculation pumping the solution mixture through the filter cartridge so as to bind the at least one biomacromolecule to the stationary phase particulate so as to form a biomacromolecule:stationary phase particulate product.Type: GrantFiled: March 10, 1994Date of Patent: November 21, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Steven M. Heilmann, Gary J. Drtina, Philip D. Eitzman, Louis C. Haddad, Frederick W. Hyde, Todd W. Johnson, Jerald K. Rassmussen, Michael G. Williams
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Patent number: 5451453Abstract: Supports having azlactone-functional surfaces, adduct supports prepared from such azlactone-functional supports, and methods of preparing both are disclosed. Azlactone functionality is introduced to surfaces of a pre-existing support in a manner which retains useful physical and chemical characteristics of the pre-existing support. One method involves exposing surfaces with high energy radiation to generate free radical reaction sites on the surfaces and causing azlactone-functional moieties to react with the free radical reaction sites. Another method involves coating surfaces with azlactone monomers, crosslinking monomers, and optionally co-monomers and polymerizing the monomers to form a polymerized coating of azlactone-functionality on the surfaces. Another method involves dispersion polymerization of azlactone-functional moieties to produce azlactone-functional particles within pores and interstices of a pre-existing support.Type: GrantFiled: June 20, 1994Date of Patent: September 19, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: David R. Gagnon, Patrick L. Coleman, Gary J. Drtina, Oh-Seung Kwon, Christopher S. Lyons, Dean S. Milbrath, Jerald K. Rasmussen, Julie B. Stahl
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Patent number: 5315006Abstract: Polycyclic diamines, incorporating a basic framework similar to [3.3.3]propellane, and derivatives of the basic polycyclic diamines and a process for preparing same are provided. The diamines are prepared by subjecting bispyridine compounds to electroreductive coupling in an acidic solution. The polycyclic diamines and derivatives thereof are useful as chain extenders, crosslinking agents and curatives in various polymer systems.Type: GrantFiled: April 6, 1993Date of Patent: May 24, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gary J. Drtina, Leif Christensen
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Patent number: 5310910Abstract: Polycyclic diamines, incorporating a basic framework similar to [3.3.3]propellane, and derivatives of the basic polycyclic diamines and a process for preparing same are provided. The diamines are prepared by subjecting bispyridine compounds to electroreductive coupling in an acidic solution. The polycyclic diamines and derivatives thereof are useful as chain extenders, crosslinking agents and curatives in various polymer systems.Type: GrantFiled: April 6, 1993Date of Patent: May 10, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gary J. Drtina, Leif Christensen
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Patent number: 5221793Abstract: Polycyclic diamines, incorporating a basic framework similar to [3.3.3]propellane, and derivatives of the basic polycyclic diamines and a process for preparing same are provided. The diamines are prepared by subjecting bispyridine compounds to electroreductive coupling in an acidic solution. The polycyclic diamines and derivatives thereof are useful as chain extenders, crosslinking agents and curatives in various polymer systems.Type: GrantFiled: March 30, 1992Date of Patent: June 22, 1993Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gary J. Drtina, Leif Christensen
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Patent number: 5157159Abstract: Mono O-hydroxyalkylated derivatives of 1,1-dihydroperfluorinated or 1H,1-alkylperfluorinated alcohols are prepared by reacting the alcohols with alkylene carbonates at a temperature of at least 60.degree. C. in the presence of a one- or two-part catalyst. The catalyst is a nitrogenous base, optionally in combination with a tetraalkylammonium halide. The O-hydroxyalkylated derivatives are useful non-ionic surfactants and emulsifiable compounds for fire extinguishing systems.Type: GrantFiled: June 13, 1991Date of Patent: October 20, 1992Assignee: Minnesota Mining and Manufacturing CompanyInventors: Eugene P. Janulis, Gary J. Drtina
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Patent number: 5124454Abstract: Polycyclic diamines, incorporating a basic framework similar to [3.3.3]propellane, and derivatives of the basic polycyclic diamines and a process for preparing same are provided. The diamines are prepared by subjecting bispyridine compounds to electroreductive coupling in an acidic solution. The polycyclic diamines and derivatives thereof are useful as chain extenders, crosslinking agents and curatives in various polymer systems.Type: GrantFiled: November 30, 1990Date of Patent: June 23, 1992Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gary J. Drtina, Leif Christensen
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Patent number: 5061294Abstract: Coated abrasive product contains a conductive, doped, conjugated polymer to reduce the static charge generated during abrading operations.Type: GrantFiled: September 24, 1990Date of Patent: October 29, 1991Assignee: Minnesota Mining and Manufacturing CompanyInventors: Walter L. Harmer, Leif Christensen, Gary J. Drtina, Harvey J. Helmin