US2807443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussive drill bit
Assignee: Joy Manufacturing Co
•
Filing: 1953-11-02
•
Granted: 1957-09-24
•
Expires: 1973-11-02
Abstract
No abstract record available.
Inventors
- 👤 Robert A Wyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:31
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B10/38; Y; Y10; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US795433A
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CH58849A
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US1854911A
Cited
US2054255A
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US2282596A
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US2368512A
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US2464781A
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DE801389C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |