Patents by Inventor Albert C. H. Lum

Albert C. H. Lum 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 latch
    Patent number: 4382621
    Abstract: Rigid with a plate mounted on a door jamb is an inward extension, on the free end of which is pivoted a latch which swings between door-blocking and door-unblocking positions. The latch is releasably retained in door-blocking position by a flat strip having one end pivoted to the latch and a free end engageable between the door and the door jamb. The latch also has an intermediate position which permits the door to be cracked open.
    Type: Grant
    Filed: June 17, 1980
    Date of Patent: May 10, 1983
    Assignee: D.S.L. Inc.
    Inventor: Albert C. H. Lum
  • Door latch
    Patent number: 4311330
    Abstract: Ridged with a plate mounted on a door jamb is an inward extension, on the free end of which is pivoted a latch which swings between door-blocking and door-unblocking positions. The latch is releasably retained in door-blocking position by a flat strip having one end pivoted to the latch and a free end engageable between the door and the door jamb. The latch also has an intermediate position which permits the door to be cracked open.
    Type: Grant
    Filed: December 21, 1979
    Date of Patent: January 19, 1982
    Assignee: D.S.L. Inc.
    Inventor: Albert C. H. Lum