US2930295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable manhole frame
Assignee: Individual
•
Filing: 1957-11-07
•
Granted: 1960-03-29
•
Expires: 1977-11-07
Abstract
No abstract record available.
Inventors
- 👤 Nathan C Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:56
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14; E02D29/1409
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US429251A
Cited
US512440A
Cited
US606206A
Cited
GB189320814A
Cited
US1076386A
Cited
GB191319468A
Cited
US1751194A
Cited
CH141824A
Cited
US2254668A
Cited
US2812654A
Cited
US2824578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |