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David A. Crown
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Waconia, MN, US
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Patents Grants
last 30 patents
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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 Applications
last 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