Patent US3530518A successfully refreshed from Google Patents.
US3530518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amphibious boat trailer
Assignee: FRANK T HALL
•
Filing: 1968-07-12
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Granted: 1970-09-29
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Expires: 1988-07-12
Abstract
No abstract record available.
Inventors
- 👤 Frank T Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:59
CPC Classifications
B; B63; B63C; B63C3/00; B63C3/12; B60; B60F; B60F3/00; B60F3/0061; B60F3/0092; B60P; B60P3/00; B60P3/06; B60P3/10; B60P3/1033
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) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |