John M. Kniffin

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Portland, OR, US

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Patents Grantslast 30 patents

Information Patent Grant
Secure entry system with radio communications
- Patent number 6,072,402
- Issue date Jun 6, 2000
- SLC Technologies, Inc.
- John M. Kniffin
- G07 - CHECKING-DEVICES
Information Patent Grant
Access control device featuring key ordering or key simultaneity
- Patent number 5,705,991
- Issue date Jan 6, 1998
- Supra Products, Inc.
- John M. Kniffin
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Electronic security system
- Patent number 5,280,518
- Issue date Jan 18, 1994
- Supra Products, Inc.
- Richard W. Danler
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES