Patent US2556583A successfully refreshed from Google Patents.
Patent US2983665A successfully refreshed from Google Patents.
US2983665A
Expired / Lapsed
US
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Utilization of low-temperature tars
Assignee: Alcoa Corp
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Filing: 1957-12-23
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Granted: 1961-05-09
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Expires: 1977-12-23
Abstract
No abstract record available.
Inventors
- 👤 Dell Manuel Benjamin
- 👤 Philip T Stroup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:57
CPC Classifications
C; C10; C10C; C10C1/00; C10C1/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN THE PRODUCTION OF HIGH-QUALITY COKE AND AROMATIC PITCH FROM LOW-TEMPERATURE TARS, THE METHOD COMPRISING THERMALLY DECOMPOSING A LOW-TEMPERATURE TAR FEEDSTOCK AT A TEMPERATURE BETWEEN 375 AND 475*C. AND A PRESSURE BETWEEN ATMOSPHERIC AND 100 POUNDS PER SQUARE INCH TO OBTAIN COKE, GAS AND CONDENSIBLE OILS, THERMALLY CRACKING AT LEAST PART OF SAID CONDENSIBLE OILS AT A TEMPERATURE BETWEEN 700* AND 900*C., AT A PRESSURE BETWEEN ATMOS-
Claim 2
Dependent Claim
67 words
IN THE PRODUCTION OF HIGH-QUALITY COKE AND AROMATIC PITCH FROM LOW-TEMPERATURE TARS, THE METHOD COMPRISING THERMALLY DECOMPOSING A LOW-TEMPERATURE TAR FEEDSTOCK AT A TEMPERATURE BETWEEN 375 AND 475*C. AND A PRESSURE BETWEEN ATMOSPHERIC AND 100 POUNDS PER SQUARE INCH TO OBTAIN COKE, GAS AND CONDENSIBLE OILS, THERMALLY CRACKING AT LEAST PART OF SAID CONDENSIBLE OILS AT A TEMPERATURE BETWEEN 700* AND 900*C., AT A PRESSURE BETWEEN ATMOS-
References Cited (Backward Citations)
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US2658857A
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US2847357A
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US2772219A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |