Patent US2384447A successfully refreshed from Google Patents.
US2384447A
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Control mechanism for mining apparatus
Assignee: SULILVAN MACHINERY Co
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Filing: 1941-05-21
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Granted: 1945-09-11
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Expires: 1961-05-21
Abstract
No abstract record available.
Inventors
- 👤 Clyde P Baldwin
- 👤 Harry H Vanderzee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:14
CPC Classifications
E; E21; E21C; E21C29/00; E21C29/22; E21C27/00; E21C27/02; E21C27/04; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6855; Y10T137/8593; Y10T137/85978; Y10T137/86035; Y10T137/86043; Y10T137/87265; Y10T137/87338
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-09-10 | 1949-03-12 | 1949-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-09-10 | 1953-03-12 | 1953-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-09-10 | 1957-03-12 | 1957-09-11 | $7700.00 | Window Closed / Lapsed |