US2589795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick-opening manhole
Assignee: Individual
•
Filing: 1946-12-06
•
Granted: 1952-03-18
•
Expires: 1966-12-06
Abstract
No abstract record available.
Inventors
- 👤 Hartwell H Gary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:40
CPC Classifications
B; B63; B63B; B63B19/00; B63B19/12; B63B19/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT8089B
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GB295815A
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US1956665A
Cited
US1979680A
Cited
US2108151A
Cited
US2093624A
Cited
US2274319A
Cited
US2330306A
Cited
US2318151A
Cited
US2373620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |