Patents by Inventor Robert S. Kaiser

Robert S. Kaiser 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).

  • Patent number: 4440428
    Abstract: This invention relates to apparatus for holding swing or slide type doors open for a controlled period of time and includes in combination a door movable between a closed first position and a fully open second position. A holding device is mounted on a stationary support in such position as to be engaged by the door when moved to its second position, this device including an electromagnet and an actuating switch so disposed as to be engaged by the door when moved to its second position. Circuitry is provided between the switch and the magnet such that upon engagement of the door with the switch, the electromagnet is energized providing a magnetic force holding the door thereagainst. The circuitry further includes time delay means for deenergizing the electromagnet and for releasing the door after a predetermined period of time.
    Type: Grant
    Filed: September 1, 1981
    Date of Patent: April 3, 1984
    Inventors: Frank L. Jessup, Robert S. Kaiser