Patent US828011A successfully refreshed from Google Patents.
Patent US3368255A successfully refreshed from Google Patents.
US3368255A
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Hole cutting apparatus for pipe sections
Assignee: United States Concrete Pipe Co
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Filing: 1965-12-01
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Granted: 1968-02-13
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Expires: 1985-12-01
Abstract
No abstract record available.
Inventors
- 👤 Herbert L Cotton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:56
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/70; B28B21/72; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0596; Y10T83/384; Y10T83/395; Y10T83/403; Y10T83/869; Y10T83/8742; Y10T83/8743; Y10T83/8748; Y10T83/8749; Y10T83/8773
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |