US3769197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pollution free fuels
Assignee: Leas Brothers Development Corp Ind
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Filing: 1971-07-09
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Granted: 1973-10-30
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Expires: 1991-07-09
Abstract
Abstract THE PRODUCTION OF LIQUID AND GASEOUS FUELS FROM COAL INCLUDING THE USE OF A METAL OXIDE FOR DESULFURIZATION.
Inventors
- 👤 L Leas
- 👤 R Leas
- 👤 C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:24
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G1/00; C10G1/002; C10G1/006; C10K; C10K1/00; C10K1/20; C10L; C10L9/00; C10L9/02
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |