TREA

Sidney Lieberman

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  • Lancaster, PA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Door closer assist linkage
    • Patent number 4,419,787
    • Issue date Dec 13, 1983
    • Dorma Door Controls Inc.
    • Sidney Lieberman
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Grant

    Hydraulic door closer construction
    • Patent number 4,394,787
    • Issue date Jul 26, 1983
    • Dorma Door Controls Inc.
    • Sidney Lieberman
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Grant

    Piston assembly for door closer
    • Patent number 4,019,220
    • Issue date Apr 26, 1977
    • Reading Door Closer Corporation
    • Sidney Lieberman
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES