Patent US2968081A successfully refreshed from Google Patents.
US2968081A
Expired / Lapsed
US
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Apparatus for encasing metal pipe in concrete
Assignee: Plasti Con Pipe Co
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Filing: 1955-10-24
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Granted: 1961-01-17
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Expires: 1975-10-24
Abstract
No abstract record available.
Inventors
- 👤 Gilbert D Williamson
- 👤 Charles T Mcneill
- 👤 Elmer L Tunsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:19
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)
US288034A
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US291849A
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US857589A
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US1007974A
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US1888101A
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US2236757A
Cited
US2256235A
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US2574213A
Cited
US2731698A
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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) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |