US3221296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spherical hydrophone
Assignee: Individual
•
Filing: 1961-01-18
•
Granted: 1965-11-30
•
Expires: 1981-01-18
Abstract
No abstract record available.
Inventors
- 👤 Allen R Milne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:01
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0637
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2413462A
Cited
US2465696A
Cited
US2762032A
Cited
FR1141962A
Cited
US2939970A
Cited
US2966656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |