Patent US2924867A successfully refreshed from Google Patents.
US2924867A
Expired / Lapsed
US
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Pipe lining troweling apparatus
Assignee: Perkins Pipe Linings Inc
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Filing: 1957-02-11
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Granted: 1960-02-16
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Expires: 1977-02-11
Abstract
No abstract record available.
Inventors
- 👤 Warren E Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:18
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/0023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US452938A
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US464756A
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US896520A
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US1180230A
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US2261928A
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US2517780A
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US2602177A
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US2575353A
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US2758352A
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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) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |