Patent US4081033A successfully refreshed from Google Patents.
Patent US3813329A successfully refreshed from Google Patents.
US3813329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of coal utilizing a heteropoly acid catalyst
Assignee: Honeywell UOP LLC
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Filing: 1972-08-18
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Granted: 1974-05-28
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Expires: 1992-08-18
Abstract
Abstract A PROCESS FOR SOLVENT EXTRACTING SOLID CARBONACEOUS MATERIALS IN WHICH A HETEROPOLY ACID OF A GROUP V-B OR GROUP VI-B METAL IS EMPLOYED AS A CATALYST AND THE HETEROPOLY ACID CATALYST OR THE GROUP V-B OR GROUP VI-B METAL COMPONENT THEREOF IS RECOVERED IN HETEROPOLY ACID FORM FROM THE SOLID RESIDUE RESULTING FROM SOLVENT EXTRACTION AND THE HETEROPOLY ACID RECOVERED IS RECYCLED TO THE SOLVENT EXTRACTION OPERATION.
Inventors
- 👤 J Gatsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:14
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/08; C10G1/086; C10G1/083
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |