Richard A. Gregory

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Chicago, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Light barrier for reopening elevator doors
- Patent number 5,627,439
- Issue date May 6, 1997
- Inventio AG
- Richard A. Gregory
- B66 - HOISTING LIFTING HAULING
Information Patent Grant
Vandal resistant push button assembly
- Patent number 5,201,409
- Issue date Apr 13, 1993
- Inventio AG
- Adolf Martin
- B66 - HOISTING LIFTING HAULING