Patents by Inventor Donald L. Walls

Donald L. Walls 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).

  • Door lock apparatus
    Patent number: 5403047
    Abstract: A locking apparatus, particularly desirable for modifying a "push/pull" latch apparatus for a hospital door, by which it may be released from a locked condition by manual effort applied from either side of the door, thus giving an unlocking effect to a door even though its locking has been caused by a manual locking effort applied by the person on the other side of the door.The apparatus has a particularly beneficial use in a large commercial installation such as a hospital, and provides that the lock-releasability may be achieved by a manual effort applied wholly on the outside of the door, as well as the person on the inside of the door being able to either lock or unlock the door; and, although the door may be locked or unlocked from either side, the unlocking component manually operable to lock or unlock the door from the outside is provided to be of such an inconspicuous nature that it would be realistically considered to not be a component with a door-unlocking effect.
    Type: Grant
    Filed: January 11, 1993
    Date of Patent: April 4, 1995
    Inventor: Donald L. Walls
  • Door lock apparatus
    Patent number: RE36209
    Abstract: A locking apparatus, particularly desirable for modifying a "push/pull" latch apparatus for a hospital door, by which it may be released from a locked condition by manual effort applied from either side of the door, thus giving an unlocking effect to a door even though its locking has been caused by a manual locking effort applied by the person on the other side of the door.The apparatus has a particularly beneficial use in a large commercial installation such as a hospital, and provides that the lock-releasability may be achieved by a manual effort applied wholly on the outside of the door, as well as the person on the inside of the door being able to either lock or unlock the door; and, although the door may be locked or unlocked from either side, the unlocking component manually operable to lock or unlock the door from the outside is provided to be of such an inconspicuous nature that it would be realistically considered to not be a component with a door-unlocking effect.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: May 11, 1999
    Inventor: Donald L. Walls
  • Torque key lever
    Patent number: D707090
    Type: Grant
    Filed: July 2, 2012
    Date of Patent: June 17, 2014
    Inventor: Donald L. Walls