Patents Assigned to D.S.L. Inc.
  • 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