Patent US3436721A successfully refreshed from Google Patents.
US3436721A
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US
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Fan beam acoustic doppler navigation system
Assignee: Arris Technology Inc
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Filing: 1968-01-16
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Granted: 1969-04-01
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Expires: 1988-01-16
Abstract
No abstract record available.
Inventors
- 👤 Harold K Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:22
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/60; G01S15/00; G01S15/02; G01S15/06; G01S15/08; G01S15/32; G01S15/50; G01S15/58; G01S15/60; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/34; G10K11/341; G10K11/343
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3257638A
Cited
US3222673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |