Patent US2916274A successfully refreshed from Google Patents.
US2916274A
Expired / Lapsed
US
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Mining machine having an arcuate cutter feed
Assignee: Potash Corp of Saskatchewan Inc
•
Filing: 1953-02-19
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Granted: 1959-12-08
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Expires: 1973-02-19
Abstract
No abstract record available.
Inventors
- 👤 Russell G Haworth
- 👤 William M Fleming
- 👤 Frederick J Priesnitz
- 👤 Asa L Mclaughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:22
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/24
Claims Analysis
Total Claims: 0
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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) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |