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Patent US3158561A successfully refreshed from Google Patents.
US3158561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquefaction of coal
Assignee: Consolidation Coal Co
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Filing: 1961-12-22
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Granted: 1964-11-24
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Expires: 1981-12-22
Abstract
No abstract record available.
Inventors
- 👤 Martin B Neuworth
- 👤 Leslie A Heredy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:52
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02; C10G; C10G1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A PROCESS FOR TREATING COAL TO RECOVER LIQUID CONSITUENTS THEREFROM WHICH COMPRISES REACTING SAID COAL WITH PHENOLIC-BF3 COMPLEX.
Claim 2
Dependent Claim
18 words
A PROCESS FOR TREATING COAL TO RECOVER LIQUID CONSITUENTS THEREFROM WHICH COMPRISES REACTING SAID COAL WITH PHENOLIC-BF3 COMPLEX.
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) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |