Andrew G. Johnson JR.

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Barre, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Algae resistant roofing granules with controlled algaecide leaching...
- Patent number 10,876,294
- Issue date Dec 29, 2020
- CertainTeed LLC
- Keith C. Hong
- E04 - BUILDING
Information Patent Grant
Algae resistant roofing granules with controlled algaecide leaching...
- Patent number 8,668,954
- Issue date Mar 11, 2014
- CertainTeed Corporation
- Keith C. Hong
- E04 - BUILDING

Patents Applicationslast 30 patents

Information Patent Application
Algae Resistant Roofing Granules with Controlled Algaecide Leaching...
- Publication number 20190249435
- Publication date Aug 15, 2019
- CertainTeed Corporation
- Keith C. Hong
- E04 - BUILDING
Information Patent Application
ALGAE RESISTANT ROOFING GRANULES WITH CONTROLLED ALGAECIDE LEACHING...
- Publication number 20140186582
- Publication date Jul 3, 2014
- Keith C. Hong
- E04 - BUILDING
Information Patent Application
Algae resistant roofing granules with controlled algaecide leaching...
- Publication number 20040258835
- Publication date Dec 23, 2004
- Keith C. Hong
- E04 - BUILDING