Patents by Inventor Otto G. G. Sprekeler

Otto G. G. Sprekeler 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).

  • Security screen door lock
    Patent number: 4286812
    Abstract: A mortise-type deadlock for hingedly-mounted doors and windows where a locking block engages the lock tongue in the extended position. A pivotally-mounted stop lever on the locking block engages an abutment in the lock body to prevent the locking block being shaken free of the lock tongue. The lock tongue may be reversible and may be removed from the lock body by operating a stop member operable from the exterior of the lock body.
    Type: Grant
    Filed: October 19, 1979
    Date of Patent: September 1, 1981
    Assignee: Whitco Pty. Ltd.
    Inventor: Otto G. G. Sprekeler