Patent US3540387A successfully refreshed from Google Patents.
US3540387A
Expired / Lapsed
US
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Process and apparatus for the combustion of carbonaceous material
Assignee: Coal Industry Patents Ltd
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Filing: 1968-10-02
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Granted: 1970-11-17
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Expires: 1988-10-02
Abstract
No abstract record available.
Inventors
- 👤 James Mclaren
- 👤 Derek F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:59
CPC Classifications
F; F23; F23C; F23C10/00; F23C10/002; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; F23B; F23B2700/00; F23B2700/009
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) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |