US3534449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming concrete pipe in situ
Assignee: No-Joint Concrete Pipe Co
•
Filing: 1967-10-12
•
Granted: 1970-10-20
•
Expires: 1987-10-12
Abstract
No abstract record available.
Inventors
- 👤 Clarence H Blixt
- 👤 Warren E Cozby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:07
CPC Classifications
F; F16; F16L; F16L1/00; F16L1/024; F16L1/028; F16L1/038
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2731698A
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US2948942A
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US3032852A
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US3161117A
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US3113364A
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US3106760A
Cited
US3338546A
Cited
US3306467A
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US3350063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |