US2990032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separator for use with rock drills
Assignee: Thor Power Tool Co
•
Filing: 1958-08-19
•
Granted: 1961-06-27
•
Expires: 1978-08-19
Abstract
No abstract record available.
Inventors
- 👤 Robert L Sandvig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:06
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2851124A
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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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |