US3484722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical modulator
Assignee: AT&T Inc
•
Filing: 1966-11-23
•
Granted: 1969-12-16
•
Expires: 1986-11-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred S Barker Jr
- 👤 Hans W Verleur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/0147; G02F2201/00; G02F2201/17
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) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |