Patent US2171553A successfully refreshed from Google Patents.
US3554720A
Expired / Lapsed
US
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Manufacture of optical plates
Assignee: Compagnie de Saint Gobain SA
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Filing: 1967-10-30
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Granted: 1971-01-12
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Expires: 1987-10-30
Abstract
Abstract OPTICAL PLATES, USEFUL INTER ALIA AS PARTS OF CATHODE TUBES, ARE MOSAICS OF INTERFITTING, PRISMATIC DISKS WITHOUT APERTURES AT THE APEXES OF THE PRISM ANGLES, OPTIONALLY WITH MEANS TO ABSORB DISPERSED LIGHT. THEY ARE MADE BY A NOVEL PROCESS.
Inventors
- 👤 Renee Michelle Crepet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/892; C; C03; C03B; C03B37/00; C03B37/10; C03B37/14; C03B37/15; H01J29/02; H01J29/10; H01J29/18; H01J29/24; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |