Patents by Inventor Albert Buhlmann

Albert Buhlmann 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).

  • Monolithic piezoelectric structural element for keyboards and method of manufacturing
    Patent number: 5374449
    Abstract: A monolithic piezoelectric key structure having a piezoelectric layer adherently connected between two conductive areas. The piezoelectric layer is applied as a fluid on the base conductive area and transformed into a coherent solid adhering to the base conductive area. The other conductive area is adherently formed on the piezoelectric layer. The monolithic structure is polarized.
    Type: Grant
    Filed: June 22, 1993
    Date of Patent: December 20, 1994
    Assignee: Algra Holding AG
    Inventors: Albert Buhlmann, Hans Schenk