US3034536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestressed concrete pipes
Assignee: Lock Joint Pipe Co
•
Filing: 1958-02-19
•
Granted: 1962-05-15
•
Expires: 1978-02-19
Abstract
No abstract record available.
Inventors
- 👤 Hugh F Kennison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:43
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/08; B; B28; B28B; B28B21/00; B28B21/56; B28B21/60; F16L25/00; F16L25/0027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US468269A
Cited
US979285A
Cited
US1900145A
Cited
US2236107A
Cited
US2662555A
Cited
GB707447A
Cited
US2686951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |