Patents by Inventor Alfred Kahan

Alfred Kahan 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).

  • Cut angles for quartz crystal resonators
    Patent number: 4499395
    Abstract: The present invention concerns itself with crystallographically doubly rotated quartz orientations vibrating in the transverse c-mode with turnover temperatures which are considerably less sensitive to angular misorientation than the comparable well known AT- or BT-cuts. These crystals are arbitrarily designated as AK-cut crystals and are defined by .phi.-angle variations between 30.degree.-60.degree. and .theta.-angle variations between 12.degree.-32.degree.. The turnover temperatures of these resonators are between 60.degree. C. and 200.degree. C.
    Type: Grant
    Filed: May 26, 1983
    Date of Patent: February 12, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Alfred Kahan