William Christopher Duffy

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Ontario, CA

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Patents Grantslast 30 patents

Information Patent Grant
Fire-rated modular duct assembly suitable for exhausting flammable...
- Patent number 9,976,768
- Issue date May 22, 2018
- DuraSystems
- William Christopher Duffy
- E04 - BUILDING
Information Patent Grant
Apparatus for a fire-rated duct
- Patent number 7,195,290
- Issue date Mar 27, 2007
- William Christopher Duffy
- A62 - LIFE-SAVING FIRE-FIGHTING

Patents Applicationslast 30 patents

Information Patent Application
Fire-Rated Modular Duct Assembly Suitable for Exhausting Flammable...
- Publication number 20170130984
- Publication date May 11, 2017
- DuraSystems
- William Christopher Duffy
- E04 - BUILDING