Inventor · disambiguated record
Frederic R. Engstrom
Also filed as: ENGSTROM FREDERIC R
4 granted patents·37 citations·filing 1977–2004
75Inventor score
Top patents by PatentIndex Score
4 records- 0178US7029130B2Contrast and brightness enhancing apertures for illumination displays3M INNOVATIVE PROPERTIES CO·Filed 2003·Granted Apr 18, 2006·18 cites·25 claims
- 0263US7350925B2Total internal reflection Fresnel lens and optical system using the same3M INNOVATIVE PROPERTIES CO·Filed 2004·Granted Apr 1, 2008·7 cites·34 claims
- 0355US4223083AVirtual mask exposure system for CRT screen manufactureTEKTRONIX INC·Filed 1977·Granted Sep 16, 1980·8 cites·7 claims
- 0451US7196687B2Swept illumination to reduce LCD lag in front and rear projection displays3M INNOVATIVE PROPERTIES CO·Filed 2003·Granted Mar 27, 2007·4 cites·19 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →