Patents by Inventor Robert John Knopf

Robert John Knopf 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: 3940542
    Abstract: Method for the production of water swellable, lightly crosslinked, hydrogel polymer tapes or fibers comprises extruding an isocyanato terminated prepolymer of a poly(alkyleneoxy) polyol and an organic diisocyanate into a coagulant or crosslinking bath containing water or organic polyamine as the crosslinker.
    Type: Grant
    Filed: June 18, 1974
    Date of Patent: February 24, 1976
    Assignee: Union Carbide Corporation
    Inventors: Robert John Knopf, Virgil Edison Matthews, Allen Paul Jones, Jr.
  • Patent number: 3939105
    Abstract: Microporous polyurethane hydrogels of high water swellability comprising lightly crosslinked polymers of isocyanate terminated prepolymers which are the reaction product of (i) poly(alkyleneoxy) polyol with (ii) organic diisocyanate that has been lightly crosslinked with (iii) water or an organic polyamine are produced by impregnating the isocyanato terminated prepolymer solution prior to contact with the crosslinking agent with a minor significant amount of a liquid non-solvent.
    Type: Grant
    Filed: June 18, 1974
    Date of Patent: February 17, 1976
    Assignee: Union Carbide Corporation
    Inventors: Allen Paul Jones, Jr., Robert John Knopf, Claude Milton Conner
  • Patent number: 3939123
    Abstract: Polyurethane hydrogels of high water swellability comprising lightly crosslinked polymers of isocyanate terminated prepolymers which are the reaction production of (i) poly(alkyleneoxy) polyols with (ii) organic diisocyanates that has been lightly crosslinked with (iii) water or an organic polyamine.BACKGROUND OF THE INVENTIONThe use of fibrous materials as absorbents for moisture is a well known, widespread practice. In this application many of the natural and synthetic fibers have been used and extensive efforts have been made to improve the absorption properties of the materials. One of the major deficiencies of the natural and synthetic materials heretofore used has been the tendency for them to release the absorbed moisture when pressure has been applied to the moisture containing material. The fact that pressure causes the absorbed fluid to be expelled from the fibers is known as reversible absorption.
    Type: Grant
    Filed: June 18, 1974
    Date of Patent: February 17, 1976
    Assignee: Union Carbide Corporation
    Inventors: Virgil Edison Matthews, Robert John Knopf