US3467144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-stressed concrete pipe and method of manufacture
Assignee: STRESSED PIPE RESEARCH Ltd
•
Filing: 1965-05-06
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Granted: 1969-09-16
•
Expires: 1985-05-06
Abstract
No abstract record available.
Inventors
- 👤 Edward K Rice
- 👤 William E Cureton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:04
CPC Classifications
F; F16; F16L; F16L25/00; F16L25/0027; B; B28; B28B; B28B21/00; B28B21/56; B28B21/60; F16L9/00; F16L9/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-15 | 1973-03-17 | 1973-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-15 | 1977-03-17 | 1977-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-15 | 1981-03-17 | 1981-09-16 | $7700.00 | Window Closed / Lapsed |