US2652435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating polycyclic aromatic compounds from organic mixtures
Assignee: Texaco Inc
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Filing: 1949-11-14
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Granted: 1953-09-15
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Expires: 1969-11-14
Abstract
No abstract record available.
Inventors
- 👤 Howard V Hess
- 👤 George B Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:51
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS FOR RECOVERING FUSED POLYCYCLIC AROMATIC COMPOUNDS AND HOMOLOGS THEREOF FROM MIXTURES CONTAINING SUCH COMPOUNDS IN COMBINATION WITH SIMILAR BOILING HYDROCARBONS WHICH COMPRISES CONTACTING SAID MIXTURE WITH TETRAHALOPHTHALIC ANHYDRIDE, FORMING A COMPLEX CONSISTING MAINLY OF SAID TETRAHALOPHTHALIC ANHYDRIDE AND SAID FUSED POLYCYCLIC AROMATIC COMPOUNDS, SEPARATING SAID COMPLEX IN SOLID FORM AT A TEMPERATURE BELOW 150* F. AND DECOMPOSING SAID COMPLEX BY CONTACT WITH STEAM AT A TEMPERATURE BETWEEN 300 AND 500* F.
Claim 2
Dependent Claim
73 words
A PROCESS FOR RECOVERING FUSED POLYCYCLIC AROMATIC COMPOUNDS AND HOMOLOGS THEREOF FROM MIXTURES CONTAINING SUCH COMPOUNDS IN COMBINATION WITH SIMILAR BOILING HYDROCARBONS WHICH COMPRISES CONTACTING SAID MIXTURE WITH TETRAHALOPHTHALIC ANHYDRIDE, FORMING A COMPLEX CONSISTING MAINLY OF SAID TETRAHALOPHTHALIC ANHYDRIDE AND SAID FUSED POLYCYCLIC AROMATIC COMPOUNDS, SEPARATING SAID COMPLEX IN SOLID FORM AT A TEMPERATURE BELOW 150* F. AND DECOMPOSING SAID COMPLEX BY CONTACT WITH STEAM AT A TEMPERATURE BETWEEN 300 AND 500* F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |