US2932874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for manufacturing concrete pipe
Assignee: Concrete Conduit Co
•
Filing: 1954-11-24
•
Granted: 1960-04-19
•
Expires: 1974-11-24
Abstract
No abstract record available.
Inventors
- 👤 Herbert P Ludwig
- 👤 Elmer L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:46
CPC Classifications
B; B28; B28B; B28B15/00; B28B21/00; B28B21/02; B28B21/10; B28B21/22; B28B21/30; B28B21/32; B28B21/90
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1346411A
Cited
US965003A
Cited
US1286056A
Cited
US1495737A
Cited
US1493399A
Cited
US1521264A
Cited
US1525878A
Cited
US1600286A
Cited
US1992739A
Cited
US2189071A
Cited
US2161968A
Cited
US2342801A
Cited
US2423557A
Cited
US2583842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |