Patent US3487647A successfully refreshed from Google Patents.
US3487647A
Expired / Lapsed
US
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Buoyancy control for scuba diving
Assignee: Individual
•
Filing: 1967-09-18
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Granted: 1970-01-06
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Expires: 1987-09-18
Abstract
No abstract record available.
Inventors
- 👤 William F Brecht Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:28
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/2245; B63C11/04; B63C11/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1579109A
Cited
US2361949A
Cited
US2887976A
Cited
US3204596A
Cited
US3161028A
Cited
US3379156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |