US3445806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for providing a diver with directional perception
Assignee: Marine Acoustical Services Inc
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Filing: 1968-01-03
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Granted: 1969-05-20
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Expires: 1988-01-03
Abstract
No abstract record available.
Inventors
- 👤 John G G Band
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:58
CPC Classifications
H; H04; H04B; H04B11/00; G; G01; G01S; G01S3/00; G01S3/80; G01S3/802; G01S3/808; G01S3/8083; Y; Y10; Y10S; Y10S367/00; Y10S367/902; Y10S367/91
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) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |