Patent US3046631A successfully refreshed from Google Patents.
US3046631A
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Apparatus and method for making prestressed concrete tubular members
Assignee: Lock Joint Pipe Co
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Filing: 1957-12-11
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Granted: 1962-07-31
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Expires: 1977-12-11
Abstract
No abstract record available.
Inventors
- 👤 Daniel E Olivier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:07
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/56; B28B21/60
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |