US2997932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manhole structure
Assignee: Individual
•
Filing: 1957-08-06
•
Granted: 1961-08-29
•
Expires: 1977-08-06
Abstract
No abstract record available.
Inventors
- 👤 William W Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:42
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL38010C
Cited
US468714A
Cited
GB190814524A
Cited
US1630557A
Cited
US1841985A
Cited
US1925635A
Cited
GB535621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |