US3540829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser detection of clear air turbulence
Assignee: AT&T Inc
•
Filing: 1968-09-09
•
Granted: 1970-11-17
•
Expires: 1988-09-09
Abstract
No abstract record available.
Inventors
- 👤 James A Collinson
- 👤 John S Cook
- 👤 Mahadevan Subramanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/88; G01S17/95; G01W; G01W1/00; G01W2001/003; Y; Y02; Y02A; Y02A90/00; Y02A90/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2964640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |