Patents by Inventor Gerhard Martin

Gerhard Martin 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).

  • Technique for fabrication of foil electret
    Patent number: 3945112
    Abstract: A technique for the fabrication of thin film electrets designed for use in electroacoustic transducers involves depositing a thin film of aluminum or titanium upon a perfluorinated foil and etching away the film prior to deposition of gold. The resultant structure evidences superior adhesion characteristics and electrical characteristics comparable to those previously described.
    Type: Grant
    Filed: March 21, 1975
    Date of Patent: March 23, 1976
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Harold Schonhorn, Gerhard Martin Sessler, James Edward West
  • Dentifrice composition
    Patent number: 3941877
    Abstract: Dentifrice composition containing a monofluorophosphate and polishing agent containing calcium carbonate and insoluble alkali metal metaphosphate, alumina or mixture therof. The ratio of calcium carbonate to insoluble alkali metal metaphosphate and to alumina is about 3:1 to about 1000:1. This dentifrice retains a desirable level of soluble fluoride upon aging and when insoluble alkali metal metaphosphate is present, does not cause substantial corrosion of unlined aluminum containers.
    Type: Grant
    Filed: May 20, 1974
    Date of Patent: March 2, 1976
    Assignee: Colgate-Palmolive Company
    Inventors: William James King, Leo Thomas Murray, Gerhard Martin Salzman