Inventor · disambiguated record
Dennis F. Vanderwerf
Also filed as: VANDERWERF DENNIS · VANDERWERF DENNIS F
29 granted patents·1,039 citations·filing 1976–2001
98Inventor score
Top patents by PatentIndex Score
29 records- 0197US6530664B2Integrated front projection system with enhanced dry erase screen configuration3M INNOVATIVE PROPERTIES CO·Filed 2001·Granted Mar 11, 2003·106 cites·21 claims
- 0297US4206969ADirectional front projection screenMINNESOTA MINING & MFG·Filed 1979·Granted Jun 10, 1980·62 cites·5 claims
- 0396US5940149APlanar polarizer for LCD projectorsMINNESOTA MINING & MFG·Filed 1997·Granted Aug 17, 1999·200 cites·26 claims
- 0495US6179426B1Integrated front projection system3M INNOVATIVE PROPERTIES CO·Filed 1999·Granted Jan 30, 2001·182 cites·35 claims
- 0591US6394609B1Integrated front projection system3M INNOVATIVE PROPERTIES CO·Filed 2000·Granted May 28, 2002·39 cites·7 claims
- 0691US4436392ADistortion correction for an overhead projector systemMINNESOTA MINING & MFG·Filed 1983·Granted Mar 13, 1984·26 cites·6 claims
- 0783US5317349AOverhead projector with achromatic fresnel lensMINNESOTA MINING & MFG·Filed 1993·Granted May 31, 1994·20 cites·8 claims
- 0883US4108540ARefractor-reflector radiation concentratorMINNESOTA MINING & MFG·Filed 1976·Granted Aug 22, 1978·48 cites·25 claims
- 0981US4800868ATilted panel linear echelon solar collectorMINNESOTA MINING & MFG·Filed 1983·Granted Jan 31, 1989·38 cites·1 claims
- 1078US5504544AProjector with multiple lamp light sourceMINNESOTA MINING & MFG·Filed 1994·Granted Apr 2, 1996·47 cites·9 claims
- 1176US4436393ADistortion correction for an overhead projector systemMINNESOTA MINING & MFG·Filed 1983·Granted Mar 13, 1984·32 cites·4 claims
- 1274US5995284APolarized illumination system for LCD projector3M INNOVATIVE PROPERTIES CO·Filed 1996·Granted Nov 30, 1999·42 cites·13 claims
- 1374US5453880AOverhead projector with achromatic Fresnel lensMINNESOTA MINING & MFG·Filed 1994·Granted Sep 26, 1995·13 cites·13 claims
- 1472US4900129ADual grooved Fresnel lens for overhead projectionMINNESOTA MINING & MFG·Filed 1988·Granted Feb 13, 1990·29 cites·3 claims
- 1566US4561740ADual-magnification rear projection lecternMINNESOTA MINING & MFG·Filed 1984·Granted Dec 31, 1985·8 cites·6 claims
- 1664US4385808APoint focus refracting radiation concentratorMINNESOTA MINING & MFG·Filed 1980·Granted May 31, 1983·18 cites·16 claims
- 1760US5296882AOverhead projector with catadioptric fresnel lensMINNESOTA MINING & MFG·Filed 1992·Granted Mar 22, 1994·16 cites·14 claims
- 1860US4741613AReduced height transmissive overhead projectorMINNESOTA MINING & MFG·Filed 1986·Granted May 3, 1988·20 cites·3 claims
- 1960US4380374AVariable focal length projection lens for use on overhead projectorsMINNESOTA MINING & MFG·Filed 1981·Granted Apr 19, 1983·6 cites·4 claims
- 2059US5446594ACatadioptric Fresnel lensMINNESOTA MINING & MFG·Filed 1994·Granted Aug 29, 1995·14 cites·3 claims
- 2154US5092672ACondenser lens system for overhead projectorMINNESOTA MINING & MFG·Filed 1991·Granted Mar 3, 1992·17 cites·11 claims
- 2252US6024452APrismatic light beam homogenizer for projection displays3M INNOVATIVE PROPERTIES CO·Filed 1997·Granted Feb 15, 2000·16 cites·20 claims
- 2352US4986651AOverhead projector with centerless Fresnel lens reflective stageMINNESOTA MINING & MFG·Filed 1989·Granted Jan 22, 1991·13 cites·16 claims
- 2446US5568324AOverhead projector with catadioptric fresnel lensMINNESOTA MINING & MFG·Filed 1995·Granted Oct 22, 1996·10 cites·3 claims
- 2543US4719547AIllumination system for overhead projectorMINNESOTA MINING & MFG·Filed 1986·Granted Jan 12, 1988·3 cites·6 claims
- 2639US6582084B2Projector having an inverted head optical arrangement3M INNOVATIVE PROPERTIES CO·Filed 2001·Granted Jun 24, 2003·0 cites·17 claims
- 2739US4744641ATelephoto lens assembly for overhead projectorMINNESOTA MINING & MFG·Filed 1987·Granted May 17, 1988·7 cites·6 claims
- 2838US4867555ARetrofocus lens for overhead projectorMINNESOTA MINING & MFG·Filed 1987·Granted Sep 19, 1989·6 cites·5 claims
- 2938USD288571SRear-projection lecternMINNESOTA MINING & MFG·Filed 1984·Granted Mar 3, 1987·1 cites·1 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →