Patent US3497787A successfully refreshed from Google Patents.
US3497787A
Expired / Lapsed
US
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Mine hoist control system
Assignee: SIEMAG Inc
•
Filing: 1967-02-03
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Granted: 1970-02-24
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Expires: 1987-02-03
Abstract
No abstract record available.
Inventors
- 👤 Ralph C Fuelster
- 👤 James R Gronseth
- 👤 Robert C Hardie
- 👤 Clifford G Pelkola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:02
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/34; B66B1/46; B66B1/52; Y; Y02; Y02B; Y02B50/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2278120A
Cited
US2382263A
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US2746567A
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US2669324A
Cited
US2804586A
Cited
US2828832A
Cited
US2792080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |