Patents by Inventor Helmut K. Singer

Helmut K. Singer 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).

  • Contact lens disinfecting system
    Patent number: 5035859
    Abstract: Contact lenses are disinfected by utilizing an N-alkyl-2-pyrrolidone as the microbicide. The efficacy of prior art microbicides such as chlorhexidene gluconate are enhanced by the addition of the pyrrolidones of this invention. The pyrrolidones suitable for use in the practice of this invention are the C.sub.8 -C.sub.20 N-alkyl-2-pyrrolidones. Preferably the alkyl moiety is octyl, decyl or dodecyl. The pyrrolidones can be utilized in solution or made available as a water soluble tablet.
    Type: Grant
    Filed: November 21, 1989
    Date of Patent: July 30, 1991
    Assignee: Schering Corporation
    Inventors: Ben Gu, Kenneth E. Bliznik, Helmut K. Singer, Sharon M. Ward