Patent US3398881A successfully refreshed from Google Patents.
US2780947A
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Tubular drill
Assignee: Star Cutter Co
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Filing: 1953-12-24
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Granted: 1957-02-12
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Expires: 1973-12-24
Abstract
No abstract record available.
Inventors
- 👤 John R Willingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:48
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/042; Y; Y10; Y10S; Y10S408/00; Y10S408/703; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455; Y10T408/55; Y10T408/556; Y10T408/5565; Y10T408/557; Y10T408/558; Y10T408/566; Y10T408/5665
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) | 1960-02-12 | 1960-08-13 | 1961-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-12 | 1964-08-13 | 1965-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-12 | 1968-08-13 | 1969-02-12 | $7700.00 | Window Closed / Lapsed |