Norman William Liefke

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Surrey, CA

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Patents Grantslast 30 patents

Information Patent Grant
Handrail and railing assembly
- Patent number 10,415,255
- Issue date Sep 17, 2019
- Chingyao Kuo
- E04 - BUILDING
Information Patent Grant
Supporting mechanism for glass fence
- Patent number 10,184,267
- Issue date Jan 22, 2019
- Chingyao Kuo
- E04 - BUILDING
Information Patent Grant
Assembly outdoor balcony
- Patent number 9,822,521
- Issue date Nov 21, 2017
- Chingyao Kuo
- E04 - BUILDING
Information Patent Grant
Accessible passageway assembly
- Patent number 9,732,528
- Issue date Aug 15, 2017
- Chingyao Kuo
- E04 - BUILDING
Information Patent Grant
Extension ladder
- Patent number 8,869,939
- Issue date Oct 28, 2014
- Ching Yao Kuo
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
Information Patent Grant
Enclosed fence/railing set
- Patent number 7,503,550
- Issue date Mar 17, 2009
- Norman William Liefke
- E04 - BUILDING
Information Patent Grant
Extension ladder with improved mechanism
- Patent number 7,316,293
- Issue date Jan 8, 2008
- Kuo-Ching Yao
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS

Patents Applicationslast 30 patents

Information Patent Application
HANDRAIL AND RAILING ASSEMBLY
- Publication number 20180258648
- Publication date Sep 13, 2018
- Chingyao KUO
- E04 - BUILDING
Information Patent Application
SUPPORTING MECHANISM FOR GLASS FENCE
- Publication number 20180002949
- Publication date Jan 4, 2018
- Chingyao KUO
- E04 - BUILDING
Information Patent Application
EXTENSION LADDER
- Publication number 20110192679
- Publication date Aug 11, 2011
- Chingyao Kuo
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
Information Patent Application
ENCLOSED FENCE/RAILING SET
- Publication number 20080164451
- Publication date Jul 10, 2008
- Norman William Liefke
- E04 - BUILDING
Information Patent Application
EXTENSION LADDER WITH IMPROVED MECHANISM
- Publication number 20070267252
- Publication date Nov 22, 2007
- Kuo-Ching Yao
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS