Vanderwerf; Dennis F.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Vanderwerf; Dennis F..The latest application filed is for "projector having an inverted head optical arrangement".
- Vanderwerf; Dennis F. - Austin TX
- Vanderwerf; Dennis F. - Cottage Grove MN
- Vanderwerf; Dennis F. - St. Paul MN
- Vanderwerf; Dennis F. - College Grove MN
| Patent | Date |
|---|---|
| Integrated front projection system with enhanced dry erase screen configuration Grant 6,530,664 - Vanderwerf , et al. March 11, 2 | 2003-03-11 |
| Projector having an inverted head optical arrangement App 20020145706 - DeLuca, Patricia H. ; et al. | 2002-10-10 |
| Integrated front projection system Grant 6,394,609 - Rodriguez, Jr. , et al. May 28, 2 | 2002-05-28 |
| Integrated front projection system with enhanced dry erase screen configuration App 20010046035 - Vanderwerf, Dennis F. ; et al. | 2001-11-29 |
| Integrated front projection system Grant 6,179,426 - Rodriguez, Jr. , et al. January 30, 2 | 2001-01-30 |
| Planar polarizer for LCD projectors Grant 5,940,149 - Vanderwerf August 17, 1 | 1999-08-17 |
| Projector with multiple lamp light source Grant 5,504,544 - Dreyer , et al. April 2, 1 | 1996-04-02 |
| Catadioptric Fresnel lens Grant 5,446,594 - Nelson , et al. August 29, 1 | 1995-08-29 |
| Overhead projector with achromatic fresnel lens Grant 5,317,349 - Vanderwerf May 31, 1 | 1994-05-31 |
| Dual grooved Fresnel lens for overhead projection Grant 4,900,129 - Vanderwerf February 13, 1 | 1990-02-13 |
| Tilted panel linear echelon solar collector Grant 4,800,868 - Appeldorn , et al. January 31, 1 | 1989-01-31 |
| Dual-magnification rear projection lectern Grant 4,561,740 - Vanderwerf December 31, 1 | 1985-12-31 |
| Distortion correction for an overhead projector system Grant 4,436,392 - Vanderwerf March 13, 1 | 1984-03-13 |
| Distortion correction for an overhead projector system Grant 4,436,393 - Vanderwerf March 13, 1 | 1984-03-13 |
| Directional front projection screen Grant 4,206,969 - Cobb , et al. June 10, 1 | 1980-06-10 |
| Refractor-reflector radiation concentrator Grant 4,108,540 - Anderson , et al. August 22, 1 | 1978-08-22 |
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