US2474887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for making arch-type culverts by means of internally positioned forms
Assignee: Individual
•
Filing: 1946-07-29
•
Granted: 1949-07-05
•
Expires: 1966-07-29
Abstract
No abstract record available.
Inventors
- 👤 Firman L Carswell
- 👤 Otto W Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:03
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/155; B21D; B21D11/00; B21D11/20; B21D11/203; B65; B65H; B65H75/00; B65H75/50
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE346455C
Cited
US97549A
Cited
US2075626A
Cited
US756832A
Cited
US823711A
Cited
US1086593A
Cited
GB156385A
Cited
US1435679A
Cited
FR583136A
Cited
US1825081A
Cited
US2316839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |