US2805760A
Expired / Lapsed
US
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Assignee: BITUMINOUS COAL RESECARCH Inc
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Filing: 1955-04-01
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Granted: 1957-09-10
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Expires: 1975-04-01
Abstract
No abstract record available.
Inventors
- 👤 Stroh Gerald F H Von
- 👤 Howard J Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:00
CPC Classifications
B; B65; B65G; B65G37/00; B65G2812/00; B65G2812/01; B65G2812/011
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) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |