Patent US2674857A successfully refreshed from Google Patents.
US2674857A
Expired / Lapsed
US
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Reinforcement for sections of embedded conduits subject to external pressure
Assignee: NEYRPIC PORTUGUESA Ltd
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Filing: 1948-10-04
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Granted: 1954-04-13
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Expires: 1968-10-04
Abstract
No abstract record available.
Inventors
- 👤 Fortes Angelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:39
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/02; F16L9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US177586A
Cited
US813918A
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US971353A
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US1096993A
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FR688641A
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US2067493A
Cited
DE619435C
Cited
US2236185A
Cited
FR857557A
Cited
US2389166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |