Patent US2921543A successfully refreshed from Google Patents.
US2921543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe-laying apparatus
Assignee: Individual
•
Filing: 1957-11-27
•
Granted: 1960-01-19
•
Expires: 1977-11-27
Abstract
No abstract record available.
Inventors
- 👤 Mcelvany James Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:26
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1342231A
Cited
DE385189C
Cited
US1600701A
Cited
US1557762A
Cited
US2029125A
Cited
US2602410A
Cited
US2738745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |