Patent US2474660A successfully refreshed from Google Patents.
US2474660A
Expired / Lapsed
US
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Manufacture of prestressed concrete pipe and the like
Assignee: Rocla Pty Ltd
•
Filing: 1947-07-19
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Granted: 1949-06-28
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Expires: 1967-07-19
Abstract
No abstract record available.
Inventors
- 👤 Fitzpatrick Frank Lionel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:11
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/70; B28B21/72; Y; Y10; Y10S; Y10S425/00; Y10S425/119
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1965748A
Cited
US2048253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |