US3437987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater navigation method and system
Assignee: Texas Instruments Inc
•
Filing: 1967-07-10
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Granted: 1969-04-08
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Expires: 1987-07-10
Abstract
No abstract record available.
Inventors
- 👤 Kenneth E Burg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:19
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/50; G01S15/58; G01S15/60; G10; G10K; G10K11/00; G10K11/004; G10K11/006; Y; Y10; Y10S; Y10S367/00; Y10S367/902
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) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |