Philip D. Sprung

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Calgary, CA

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Patents Grantslast 30 patents

Information Patent Grant
Stressed membrane space enclosure
- Patent number 4,137,687
- Issue date Feb 6, 1979
- Philip D. Sprung
- E04 - BUILDING
Information Patent Grant
Building structure
- Patent number 4,118,904
- Issue date Oct 10, 1978
- Philip D. Sprung
- E04 - BUILDING

Patents Applicationslast 30 patents

Information Patent Application
Door arrangement for tensioned membrane structure
- Publication number 20030019166
- Publication date Jan 30, 2003
- Philip D. Sprung
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS