Patents by Inventor Ernst E. Zandelin

Ernst E. Zandelin 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).

  • Card index
    Patent number: 4187631
    Abstract: A telephone subscriber's card index includes a flat casing having a top, side walls and a front opening, a tray adapted to be pushed into and pulled out of the casing through said opening, and a pile of index cards supported on the tray and intended to have information thereon. The index includes manually operable depressible keys, with dogs on the underside of the keys, for determining, before pulling out the tray, which index card is to be presented to an operator by depression of an optionally selected one of said keys.
    Type: Grant
    Filed: March 1, 1978
    Date of Patent: February 12, 1980
    Assignee: Sony Corporation
    Inventor: Ernst E. Zandelin