US2820515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hold hatches operated with the aid of a pressure medium
Assignee: Goetaverken AB
•
Filing: 1954-10-22
•
Granted: 1958-01-21
•
Expires: 1974-10-22
Abstract
No abstract record available.
Inventors
- 👤 Aarvld Reinhardt Olai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:44
CPC Classifications
B; B63; B63B; B63B19/00; B63B19/12; B63B19/14; B63B19/19; B63B19/197
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2113291A
Cited
US2322372A
Cited
FR971979A
Cited
FR55607E
Cited
US2491261A
Cited
US2640454A
Cited
FR1040958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |