US3135681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of dewatering tar
Assignee: United States Steel Corp
•
Filing: 1962-05-11
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Granted: 1964-06-02
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Expires: 1982-05-11
Abstract
No abstract record available.
Inventors
- 👤 James L Pflasterer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:06
CPC Classifications
C; C10; C10C; C10C1/00; C10C1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF DEWATERING WET COAL TAR COMPRISING ADMIXING THEREWITH A COAL-TAR CREOSOTE-OIL FRACTION, CONDUCTING THE ADMIXTURE TO THE TOP OF A STORAGE TANK, MAINTAINING AN ASCENDING TEMPERATURE GRADIENT IN SAID ADMIXTURE FROM THE TOP OF SAID TANK TO THE BOTTOM WHILE ALLOWING THE ADMIXTURE TO SEPARATE, CONDUCTING SEPARATED LIQUOR FROM THE TOP OF SAID TANK AND DEWATERED TAR FROM THE BOTTOM THEREOF.
Claim 2
Independent Claim
63 words
A METHOD OF DEWATERING WET COAL TAR COMPRISING ADMIXING THEREWITH A COAL-TAR CREOSOTE-OIL FRACTION, CONDUCTING THE ADMIXTURE TO THE TOP OF A STORAGE TANK, MAINTAINING AN ASCENDING TEMPERATURE GRADIENT IN SAID ADMIXTURE FROM THE TOP OF SAID TANK TO THE BOTTOM WHILE ALLOWING THE ADMIXTURE TO SEPARATE, CONDUCTING SEPARATED LIQUOR FROM THE TOP OF SAID TANK AND DEWATERED TAR FROM THE BOTTOM THEREOF.
References Cited (Backward Citations)
US2774716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |