US3725241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solids removal from hydrogenated coal liquids
Assignee: HRI Inc
•
Filing: 1971-12-09
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Granted: 1973-04-03
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Expires: 1991-12-09
Abstract
Abstract BETTER THAN FIFTY PERCENT OF THE ASH AND ASSOCIATED SOLIDS FROM A COATED-DERIVED OIL, SUCH AS A HYDROGENATED COAL PRODUCT, ARE REMOVED BY MAGNETIC SEPARATION. THE ASH AND ASSOCIATED SOLIDS HAVE BEEN RENDERED MAGNETICALLY SUSCEPTIBLE BY PRIOR HYDROGENATION TREATMENT.
Inventors
- 👤 M Chervenak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:17
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/08; C10G1/083; C10G1/04; C10G1/045
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |