TREA

Michael D. Blackston

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  • Brooklyn Park, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Breakaway for revolving doors
    • Patent number 4,562,665
    • Issue date Jan 7, 1986
    • Heise Mfg., Inc.
    • Michael D. Blackston
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Grant

    Revolving door security system
    • Patent number 4,534,131
    • Issue date Aug 13, 1985
    • Heise Manufacturing
    • Michael D. Blackston
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Grant

    Revolving door system
    • Patent number 4,530,183
    • Issue date Jul 23, 1985
    • Heise Manufacturing Co., Inc.
    • Stanley R. Heise
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Grant

    Revolving door system
    • Patent number 4,475,308
    • Issue date Oct 9, 1984
    • Heise Manufacturing Co., Inc.
    • Stanley R. Heise
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Grant

    Revolving door system
    • Patent number 4,458,447
    • Issue date Jul 10, 1984
    • Heise Manufacturing Co., Inc.
    • Stanley R. Heise
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES