US3552822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rear projection screen
Assignee: Individual
•
Filing: 1968-06-07
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Granted: 1971-01-05
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Expires: 1988-06-07
Abstract
Abstract A REAR PROJECTION SCREEN OF HIGH EFFICIENCY IS CONSTRUCTED WITH A REFRACTING MICROSPHERE COMPONENT WHICH INCLUDES A DISTRIBUTION OF MICROSPHERES IN A TRANSPARENT SUPPORT AND AN ANTIREFLECTION COMPONENT WHICH IS NOT ADVERSE TO HIGH OPTICAL TRANSMISSIVITY FOR LIGHT FROM A PROJECTOR AND WHICH ENHANCES TRANSMISSIVITY AND/OR ABSORBTIVITY FOR LIGHT EMANATING FROM THE GENERAL DIRECTION OF AN OBSERVER.
Inventors
- 👤 Gerald Altman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:14
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |