Patents by Inventor Daniel C. Duan

Daniel C. Duan 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).

  • Patent number: 6126919
    Abstract: Methods, compounds, and medicinal formulations utilizing biocompatible polymers for delivery of a drug, particularly for solubilizing, stabilizing and/or providing sustained release of drug from topical, implantable, and inhalation systems. Many of the methods, compounds, and medicinal formulations are particularly suitable for oral and/or nasal inhalation and use polymers of the formula --[X--R.sup.1 --C(O)]-- wherein each R.sup.1 is an independently selected organic group that links the --X-- group to the carbonyl group, and each X is independently oxygen, sulfur, or catenary nitrogen.
    Type: Grant
    Filed: February 7, 1997
    Date of Patent: October 3, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: James S. Stefely, David W. Schultz, Luke E. Schallinger, Craig A. Perman, Chester L. Leach, Daniel C. Duan
  • Patent number: 6042811
    Abstract: A medicinal aerosol formulation containing a particulate drug and a diol/diacid condensate as a dispersing aid.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: March 28, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Daniel C. Duan, James S. Stefely, David W. Schultz, Chester L. Leach
  • Patent number: 5725841
    Abstract: A medicinal aerosol formulation containing a particulate drug and a dispersing aid derived from a hydroxyacid, a mercapto acid, or an amino acid.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: March 10, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Daniel C. Duan, James S. Stefely, David W. Schultz, Chester L. Leach
  • Patent number: 5670097
    Abstract: The present invention provides a shaped permeable polymeric material including a hydrophobic portion and a hydrophilic portion, wherein the material is crosslinked. This material is prepared by a method including the steps preparing a crosslinkable composition having a hydrophobic portion and a hydrophilic portion; placing the crosslinkable composition in a mold; gelling the crosslinkable composition to form a shaped gelled polymeric composition comprising a hydrophobic portion, a hydrophilic portion, and a liquid portion; and exchanging the liquid portion with an exchange liquid to form the permeable polymeric material. Preferably this material is used in a blood gas sensor.
    Type: Grant
    Filed: December 8, 1994
    Date of Patent: September 23, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Daniel C. Duan, Mark S. Schaberg, Terence M. Fogarty, William L. Howard, Jr., Kenneth B. Wood
  • Patent number: 5569450
    Abstract: A medicinal aerosol formulation containing a particulate drug and a dispersing aid derived from a hydroxyacid, a mercapto acid, or an amino acid.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: October 29, 1996
    Assignee: Minnesota Mining And Manufacturing Company
    Inventors: Daniel C. Duan, James S. Stefely, David W. Schultz, Chester L. Leach
  • Patent number: 5438988
    Abstract: A hydrophilic, pressure-sensitive adhesive composition prepared by irradiating solid poly(N-vinyl lactam) with ionizing radiation to crosslink the poly(N-vinyl lactam) and thereafter mixing the radiation-crosslinked poly(N-vinyl lactam) with essentially unirradiated plasticizer in an amount sufficient to form a cohesive, pressure-sensitive adhesive composition. The composition is useful as a biomedical adhesive for transmitting or receiving electrical signals as a component of a biomedical electrode. The composition is also useful as a drug delivery device to deliver pharmaceuticals or other active ingredients to or through mammalian skin. The composition is also useful as a component in a skin covering for protecting mammalian skin or mammalian skin openings with antimicrobial agents. A method of preparation of the composition is also disclosed.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: August 8, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Daniel C. Duan, Robert A. Asmus, Timothy M. Dietz, Rosa Uy, Olester Benson, Jr.
  • Patent number: 5409966
    Abstract: A hydrophilic, pressure-sensitive adhesive composition prepared by irradiating solid poly(N-vinyl lactam) with ionizing radiation to crosslink the poly(N-vinyl lactam) and thereafter mixing the radiation-crosslinked poly(N-vinyl lactam) with essentially unirradiated plasticizer in an amount sufficient to form a cohesive, pressure-sensitive adhesive composition. The composition is useful as a biomedical adhesive for transmitting or receiving electrical signals as a component of a biomedical electrode. The composition is also useful as a drug delivery device to deliver pharmaceuticals or other active ingredients to or through mammalian skin. The composition is also useful as a component in a skin covering for protecting mammalian skin Or mammalian skin openings with antimicrobial agents. A method of preparation of the composition is also disclosed.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: April 25, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Daniel C. Duan, Robert A. Asmus, Timothy M. Dietz, Rosa Uy, Olester Benson, Jr.
  • Patent number: 5389376
    Abstract: A hydrophilic, pressure-sensitive adhesive composition prepared by irradiating solid poly(N-vinyl lactam) with ionizing radiation to crosslink the poly(N-vinyl lactam) and thereafter mixing the radiation-crosslinked poly(N-vinyl lactam) with essentially unirradiated plasticizer in an amount sufficient to form a cohesive, pressure-sensitive adhesive composition. The composition is useful as a biomedical adhesive for transmitting or receiving electrical signals as a component of a biomedical electrode. The composition is also useful as a drug delivery device to deliver pharmaceuticals or other active ingredients to or through mammalian skin. The composition is also useful as a component in a skin covering for protecting mammalian skin or mammalian skin openings with antimicrobial agents. A method of preparation of the composition is also disclosed.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: February 14, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Daniel C. Duan, Robert A. Asmus, Timothy M. Dietz, Rosa Uy, Olester Benson, Jr.
  • Patent number: 5276079
    Abstract: A hydrophilic, pressure-sensitive adhesive composition prepared by irradiating solid poly(N-vinyl lactam) with ionizing radiation to crosslink the poly(N-vinyl lactam) and thereafter mixing the radiation-crosslinked poly(N-vinyl lactam) with essentially unirradiated plasticizer in an amount sufficient to form a cohesive, pressure-sensitive adhesive composition. The composition is useful as a biomedical adhesive for transmitting or receiving electrical signals as a component of a biomedical electrode. The composition is also useful as a drug delivery device to deliver pharmaceuticals or other active ingredients to or through mammalian skin. The composition is also useful as a component in a skin covering for protecting mammalian skin or mammalian skin openings with antimicrobial agents. A method of preparation of the composition is also disclosed.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: January 4, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Daniel C. Duan, Robert A. Asmus, Timothy M. Dietz, Rosa Uy, Olester Benson, Jr.
  • Patent number: 5225473
    Abstract: Hydrophilic, cohesive, pressure-sensitive adhesive compositions are provided comprising a) a crosslinked, swellable polymeric matrix made from an N-vinyl lactam monomer and a multi-ethylenically unsaturated compound, wherein the ethylenic groups are vinyl groups, allyl groups, and/or methallyl groups, which groups are bonded to nitrogen or oxygen atoms, and b) a plasticizer for the copolymer wherein the amount of the multi-ethylenically unsaturated compound and the plasticizer are present in amounts sufficient to render the polymeric matrix cohesive, swellable and pressure-sensitive adhesive. These compositions can also be used as adhesives for biomedical electrodes and transdermal drug delivery systems.
    Type: Grant
    Filed: April 9, 1992
    Date of Patent: July 6, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Daniel C. Duan
  • Patent number: 4956230
    Abstract: Transparent sheet for use with ink jet printers and pen plotters which utilize hydrophilic solvent-based inks. The sheet comprises a transparent backing bearing on at least one major surface thereof a transparent coating formed of a blend of at least one hydrophilic polymer containing a carbonylamido functional group and at least one hydrophobic polymer substantially free of acidic functional groups, hydroxyl groups, >NH groups and --NH.sub.2 groups.
    Type: Grant
    Filed: February 2, 1988
    Date of Patent: September 11, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Donald W. Edwards, Armin J. Paff, Daniel C. Duan
  • Patent number: 4931282
    Abstract: A pressure-sensitive medical sealant composition comprising (a) a crosslinked, swellable polymeric matrix made from an N-vinyl lactam monomer and a multi-ethylenically unsaturated compound, wherein the ethylenic groups are vinyl groups, allyl groups or methallyl groups, which groups are bonded to nitrogen or oxygen atoms; (b) a plasticizer; and (c) an antimicrobial. The medical sealant is highly moisture vapor transmissive and is capable of incorporating large concentrations of iodine. The composition can be used in a variety of medical applications including as a teat plug, a wound or burn dressing, or as a sealant to seal junctions between medical instruments penetrating the skin and the skin. A method of preparing the medical sealant composition in a caulkable form is also disclosed.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: June 5, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert A. Asmus, Daniel C. Duan
  • Patent number: 4781978
    Abstract: Article comprising a substrate bearing an optically clear, non-crosslinked coating formed from a blend comprising at least one polymer containing carbonylamido functional groups and at least one hydrophobic polymer substantially free of acidic functional groups.The coating is useful for promoting adhesion, increasing the hydrophilicity of the surface of the article, and increasing receptivity of the substrate for aqueous based inks.
    Type: Grant
    Filed: March 2, 1987
    Date of Patent: November 1, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Daniel C. Duan