David A. Crown

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Waconia, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Hydraulic leveraged overhead door assembly
- Patent number 8,714,229
- Issue date May 6, 2014
- Crown Industries, Inc.
- David A. Crown
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Door assembly
- Patent number 7,814,957
- Issue date Oct 19, 2010
- David A Crown
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES

Patents Applicationslast 30 patents

Information Patent Application
HYDRAULIC LEVERAGED OVERHEAD DOOR ASSEMBLY
- Publication number 20130319623
- Publication date Dec 5, 2013
- CROWN INDUSTRIES, INC.
- David A. Crown
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Application
Door Assembly
- Publication number 20080086947
- Publication date Apr 17, 2008
- David A. Crown
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES