US3559221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer hull for a small boat
Assignee: Individual
•
Filing: 1968-01-11
•
Granted: 1971-02-02
•
Expires: 1988-01-11
Abstract
Abstract This disclosure comprises a panel, shell, hull of a boat, or other formed shape which consists of outer and inner thin sheets of aluminum bonded together and made rigid by an internal layer of epoxy or other resinous cement.
Inventors
- 👤 Paul B Juhnke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:40
CPC Classifications
B; B63; B63B; B63B5/00; B63B5/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |