Sitzema, Jr.; Ronald L.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Sitzema, Jr.; Ronald L..The latest application filed is for "lighting fixture optical assembly including relector/refractor and collar for enhanced directional illumination control".
- Sitzema, Jr.; Ronald L. - Ellsworth MI
| Patent | Date |
|---|---|
| Lighting fixture optical assembly including relector/refractor and collar for enhanced directional illumination control Grant 6,698,908 - Sitzema, Jr. , et al. March 2, 2 | 2004-03-02 |
| Tubular skylight with improved dome Grant RE38,217 - DeBlock , et al. August 19, 2 | 2003-08-19 |
| Tubular skylight with offset dome Grant 5,983,581 - DeBlock , et al. November 16, 1 | 1999-11-16 |
| Tubular skylight with improved dome Grant 5,655,339 - DeBlock , et al. August 12, 1 | 1997-08-12 |
| Solar powered lamp having a cover containing a fresnel lens structure Grant 5,228,772 - Mitchell , et al. July 20, 1 | 1993-07-20 |
| Vacuum cleaner headlight Grant 5,207,498 - Lawrence , et al. May 4, 1 | 1993-05-04 |
| Adjustable exterior light Grant D333,008 - Frost , et al. February 2, 1 | 1993-02-02 |
| Reflector/refractor Grant 4,839,781 - Barnes , et al. June 13, 1 | 1989-06-13 |
| Luminaire adapted for horizontal and vertical operation Grant 4,398,239 - de Vos , et al. August 9, 1 | 1983-08-09 |
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