John Allen Barkley

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Boulder County, CO, US

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Patents Grantslast 30 patents

Information Patent Grant
Electrophotographic photoreceptive background areas cleaned by back...
- Patent number 4,265,998
- Issue date May 5, 1981
- International Business Machines Corporation
- John A. Barkley
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Light pipe for accurate erasure of photoconductor charge
- Patent number 4,255,042
- Issue date Mar 10, 1981
- International Business Machines Corporation
- John D. Armitage
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Magnetic head housing with wedge locking means
- Patent number 4,037,264
- Issue date Jul 19, 1977
- International Business Machines Corporation
- John Allen Barkley
- G11 - INFORMATION STORAGE