US3485531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Program controlled contour cutting boring miner
Assignee: Westinghouse Air Brake Co
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Filing: 1968-02-26
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Granted: 1969-12-23
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Expires: 1988-02-26
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Risse
- 👤 Howard E Shelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:54
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/282; E21C31/00; E21C31/12; E21C35/302
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |