US3069347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the anthracene content of creosote
Assignee: United States Steel Corp
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Filing: 1960-04-05
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Granted: 1962-12-18
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Expires: 1980-04-05
Abstract
No abstract record available.
Inventors
- 👤 Claude E Bole
- 👤 Gilbert Gerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:08
CPC Classifications
C; C10; C10C; C10C1/00; C10C1/04; C10C1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
THE METHOD OF INCREASING THE CONCENTRATION OF ANTHRACENE IN COAL TAR WHICH COMPRISES FRACTIONALLY DISTILLING COAL TAR, COLLECTING THE FRACTION BOILING BETWEEN 315 AND 355*C. CONTAINING ANTHRACENE PRECURSORS INCLUDING 9.10-DIHYDROANTHRACENE AND 1,2,3,4-TETRAHYDROANTHRACENE, AND HOLDING SAID FRACTION AT A TEMPERATURE BETWEEN 280 AND 380*C. FOR FROM ONE TO ELEVEN HOURS, THEREBY DEHYDROGENATING SAID PRECURSORS AND CONVERTING THEM AT LEAST IN PART TO ANTHRACENE.
Claim 2
Independent Claim
62 words
THE METHOD OF INCREASING THE CONCENTRATION OF ANTHRACENE IN COAL TAR WHICH COMPRISES FRACTIONALLY DISTILLING COAL TAR, COLLECTING THE FRACTION BOILING BETWEEN 315 AND 355*C. CONTAINING ANTHRACENE PRECURSORS INCLUDING 9.10-DIHYDROANTHRACENE AND 1,2,3,4-TETRAHYDROANTHRACENE, AND HOLDING SAID FRACTION AT A TEMPERATURE BETWEEN 280 AND 380*C. FOR FROM ONE TO ELEVEN HOURS, THEREBY DEHYDROGENATING SAID PRECURSORS AND CONVERTING THEM AT LEAST IN PART TO ANTHRACENE.
References Cited (Backward Citations)
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Cited
US2007212A
Cited
US2161066A
Cited
US2438148A
Cited
US2475977A
Cited
US2868713A
Cited
US2795538A
Cited
US2838346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |