US3469821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depth control system for towed body
Assignee: United States Department of the Navy
•
Filing: 1967-03-20
•
Granted: 1969-09-30
•
Expires: 1987-03-20
Abstract
No abstract record available.
Inventors
- 👤 Seymour Gross
- 👤 William A Downes
- 👤 Frank B Rakoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:06
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/28; B66D1/40; B66D1/48; B66D2700/00; B66D2700/01; B66D2700/0108
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2414473A
Cited
US2876963A
Cited
GB815544A
Cited
US3088710A
Cited
DE1202453B
Cited
US3259371A
Cited
US3276748A
Cited
US3282568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |