Donald K. Cohen

Person

Tucson, AZ, US

People

Patents Grantslast 30 patents

Information Patent Grant
Rough surface profiler and method
- Patent number 5,355,221
- Issue date Oct 11, 1994
- Wyko Corporation
- Donald K. Cohen
- G01 - MEASURING TESTING
Information Patent Grant
Rough surface profiler and method
- Patent number 5,204,734
- Issue date Apr 20, 1993
- Wyko Corporation
- Donald K. Cohen
- G01 - MEASURING TESTING
Information Patent Grant
Rough surface profiler and method
- Patent number 5,133,601
- Issue date Jul 28, 1992
- Wyko Corporation
- Donald K. Cohen
- G01 - MEASURING TESTING
Information Patent Grant
Apparatus and method for simultaneous measurement of film thickness...
- Patent number 5,129,724
- Issue date Jul 14, 1992
- Wyko Corporation
- Chris P. Brophy
- G01 - MEASURING TESTING
Information Patent Grant
Apparatus and method for automatically focusing an interference mic...
- Patent number 5,122,648
- Issue date Jun 16, 1992
- Wyko Corporation
- Donald K. Cohen
- G02 - OPTICS
Information Patent Grant
Apparatus and method for automatically focusing an interference mic...
- Patent number 4,931,630
- Issue date Jun 5, 1990
- Wyko Corporation
- Donald K. Cohen
- G02 - OPTICS
Information Patent Grant
Optical signal recorders employing two lasers and methods therefor
- Patent number 4,694,447
- Issue date Sep 15, 1987
- International Business Machines Corp.
- Donald K. Cohen
- G11 - INFORMATION STORAGE
Information Patent Grant
Focus detector for optical apparatus
- Patent number 4,672,188
- Issue date Jun 9, 1987
- International Business Machines Corporation
- Donald K. Cohen
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical systems employing ovate light beams
- Patent number 4,609,813
- Issue date Sep 2, 1986
- International Business Machines Corporation
- Donald K. Cohen
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical focus detection employing rotated interference patterns
- Patent number 4,604,739
- Issue date Aug 5, 1986
- International Business Machines Corporation
- Donald K. Cohen
- G02 - OPTICS
Information Patent Grant
An adjustable-optical prism with integral-polarizing beam splitter...
- Patent number 4,588,263
- Issue date May 13, 1986
- International Business Machines Corporation
- Donald K. Cohen
- G02 - OPTICS

Donald K. Cohen

Person

Patents Grantslast 30 patents

Rough surface profiler and method

Rough surface profiler and method

Rough surface profiler and method

Apparatus and method for simultaneous measurement of film thickness...

Apparatus and method for automatically focusing an interference mic...

Apparatus and method for automatically focusing an interference mic...

Optical signal recorders employing two lasers and methods therefor

Focus detector for optical apparatus

Optical systems employing ovate light beams

Optical focus detection employing rotated interference patterns

An adjustable-optical prism with integral-polarizing beam splitter...