Patents by Inventor Calvin Q. Lundgren

Calvin Q. Lundgren 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).

  • Sliding door lock
    Patent number: 4170885
    Abstract: Disclosed is a locking device for locking bypassing sliding doors having support frames positioned in close proximity when the doors are translated to a position for locking. A locking arm is carried by one of the support frames and locking means are carried by the other support frame and are slidably engagable with the locking arm when the supports are in close proximity, thereby locking the doors.
    Type: Grant
    Filed: May 22, 1978
    Date of Patent: October 16, 1979
    Inventor: Calvin Q. Lundgren