Patents by Inventor Mathew F. Betkouski

Mathew F. Betkouski 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).

  • Dead bolt lock accessory
    Patent number: 4238943
    Abstract: A device for mounting on the inside of doors employing a dead bolt lock to cause the lock to be opened from the outside with a key but only after turning the key to the right and to the left a given number of times. The advantage of this device is to provide a selected time delay in unlocking the door.
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: December 16, 1980
    Inventor: Mathew F. Betkouski