US2974568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light modulator
Assignee: AT&T Inc
•
Filing: 1957-02-15
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Granted: 1961-03-14
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Expires: 1977-02-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph F Dillon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:01
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2641; C04B35/2675; G; G02; G02B; G02B27/00; G02B27/28; G02F; G02F1/00; G02F1/01; G02F1/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |