US3030852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device for use in controlling light transmission
Assignee: AT&T Inc
•
Filing: 1960-10-07
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Granted: 1962-04-24
•
Expires: 1980-10-07
Abstract
No abstract record available.
Inventors
- 👤 Jeofry S Courtney-Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/02; G02B6/00; G02B6/04; G02B6/06; G02F; G02F1/00; G02F1/01; G02F1/011; G02F1/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2072419A
Cited
US1877744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |