Patent US2605534A successfully refreshed from Google Patents.
US2605534A
Expired / Lapsed
US
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Core for use in molding concrete pipe in situ
Assignee: Individual
•
Filing: 1949-01-31
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Granted: 1952-08-05
•
Expires: 1969-01-31
Abstract
No abstract record available.
Inventors
- 👤 John W Colvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:00
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)
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US1191731A
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US1269553A
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US1452381A
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US1486204A
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US1540185A
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US1639855A
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US2052372A
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US2177221A
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US2306037A
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US2386615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-05 | 1956-02-04 | 1956-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-05 | 1960-02-04 | 1960-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-05 | 1964-02-04 | 1964-08-05 | $7700.00 | Window Closed / Lapsed |