US2593918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manhole extension
Assignee: Individual
•
Filing: 1948-09-29
•
Granted: 1952-04-22
•
Expires: 1968-09-29
Abstract
No abstract record available.
Inventors
- 👤 Redman Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:16
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14; E02D29/1409
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US263448A
Cited
US1693190A
Cited
US1959171A
Cited
US2185488A
Cited
US2315236A
Cited
US2431082A
Cited
US4363567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |