US2877696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manhole covers and frames
Assignee: Dover Engineering Works Ltd
•
Filing: 1953-06-09
•
Granted: 1959-03-17
•
Expires: 1973-06-09
Abstract
No abstract record available.
Inventors
- 👤 Elkington Vivian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:48
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE282946C
Cited
US149246A
Cited
US636722A
Cited
US979182A
Cited
US1032503A
Cited
US1087366A
Cited
US1820127A
Cited
GB375814A
Cited
GB447063A
Cited
GB535177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |