US3598640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rear projection screen,screen coating and method
Assignee: GAF Corp
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Filing: 1968-01-19
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Granted: 1971-08-10
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Expires: 1988-01-19
Abstract
Abstract A REAR PROJECTION SCREEN WHICH INCLUDES, ON THE REAR OR IMAGE-RECEIVING FACE THEREOF, A COATING COMPRISING A TRANSPARENT ORGANIC VEHICLE AND A SMALL PROPORTION OF A LIGHT-DIFFUSING SILICA MATERIAL PREFERABLY A SYNTHETIC, AMORPHOUS SILICA HAVING GENERALLY MICRON-SIZED PARTICLES, AND WHEREIN SUBSTANTIALLY ALL OF THE PARTICLES INCLDUE CAPILLARY PASSAGES THEREIN, AND WHEREIN A SUBSTANTIAL PROPORTION OF THE SILICA PARTICLES ARE HELD IN PLACE BY SAID VEHICLE AT THE OUTER SURFACE OF THE COATING IN A MANNER SUCH THAT AT LEAST PORTIONS OF THE PARTICLES ARE EXPOSED TO ATMOSPHERE, RATHER THAN BEING COMPLETLY EMBEDDED IN THE VEHICLE OF THE COATING MATERIAL.
Inventors
- 👤 Frank P Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:20
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24421; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985; Y10T428/249987; Y10T428/24999; Y10T428/249991; Y10T428/249992; Y10T428/25; Y10T428/259; Y10T428/26
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |