Patents by Inventor Dieter Schapel

Dieter Schapel 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).

  • Production of molds using gel compositions with depot action based on a polyurethane matrix and relatively high molecular weight polyols
    Patent number: 4466936
    Abstract: A polyol gel is made from 15-62 wt. % (based on the sum of polyurethane matrix plus dispersing agent) of a high molecular weight covalently cross-linked polyurethane matrix; 85-38 wt. % (based on the sum of polyurethane matrix plus dispersing agent) of a liquid dispersing agent which is firmly bonded to the matrix; and optionally, active ingredients, fillers, additives, catalysts, and mixtures thereof. The liquid dispersing agent is a polyhydroxyl compound having a molecular weight of between 1,000 and 12,000 and an OH number between 20 and 112. This dispersing agent should have virtually no hydroxyl compounds having a molecular weight below 800 present. These gel compositions may be used to make mold impressions and highly stable active-ingredient releasing compositions.
    Type: Grant
    Filed: June 9, 1983
    Date of Patent: August 21, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventor: Dieter Schapel