Patent US3514215A successfully refreshed from Google Patents.
US3514215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydropropeller
Assignee: Individual
•
Filing: 1969-02-20
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Granted: 1970-05-26
•
Expires: 1989-02-20
Abstract
No abstract record available.
Inventors
- 👤 Paul E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:39
CPC Classifications
B; B63; B63H; B63H1/00; B63H1/02; B63H1/12; B63H1/14; B63H1/18; B63H1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1095732A
Cited
US1506937A
Cited
US1862207A
Cited
US1980614A
Cited
US3065933A
Cited
US3282352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |