Karl-Heinz Dreifert

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Velbert, DE

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Patents Grantslast 30 patents

Information Patent Grant
Mechanism for releasably locking sashes in door-or window frames
- Patent number 5,370,428
- Issue date Dec 6, 1994
- Wilhelm Weidtmann GmbH & Co. KG
- Karl-Heinz Dreifert
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Device for locking and unlocking sashes in door- or window frames
- Patent number 5,318,333
- Issue date Jun 7, 1994
- Wilhelm Weidtmann GmbH & Co. KG
- Karl-Heinz Dreifert
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Window with pivotable sash and mechanism for locking the sash in cl...
- Patent number 5,111,615
- Issue date May 12, 1992
- Wilhelm Weidtmann GmbH & Co. KG
- Erhard Kuhnt
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES