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Frederic R. Engstrom
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Hillsboro, OR, US
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Patents Grants
last 30 patents
Information
Patent Grant
Total internal reflection Fresnel lens and optical system using the...
Patent number
7,350,925
Issue date
Apr 1, 2008
3M Innovative Properties Company
Frederic R. Engstrom
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Swept illumination to reduce LCD lag in front and rear projection d...
Patent number
7,196,687
Issue date
Mar 27, 2007
3M Innovative Properties Company
Arlie R. Conner
G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information
Patent Grant
Contrast and brightness enhancing apertures for illumination displays
Patent number
7,029,130
Issue date
Apr 18, 2006
3M Innovative Properties Company
Bruce L. Cannon
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Virtual mask exposure system for CRT screen manufacture
Patent number
4,223,083
Issue date
Sep 16, 1980
Tektronix, Inc.
Frederic R. Engstrom
H01 - BASIC ELECTRIC ELEMENTS
Patents Applications
last 30 patents
Information
Patent Application
Total internal reflection fresnel lens and optical system using the...
Publication number
20060050241
Publication date
Mar 9, 2006
Frederic R. Engstrom
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Contrast and brightness enhancing apertures for illumination displays
Publication number
20050140933
Publication date
Jun 30, 2005
Bruce L. Cannon
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Swept illumination to reduce LCD lag in front and rear projection d...
Publication number
20040135754
Publication date
Jul 15, 2004
Arlie R. Conner
H04 - ELECTRIC COMMUNICATION TECHNIQUE