Patent US2659762A successfully refreshed from Google Patents.
US2659762A
Expired / Lapsed
US
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Isodurene manufacture
Assignee: Standard Oil Co
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Filing: 1952-07-24
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Granted: 1953-11-17
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Expires: 1972-07-24
Abstract
No abstract record available.
Inventors
- 👤 Arthur P Lien
- 👤 David A Mccaulay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:52
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/274; C07C5/2748
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS FOR THE PRODUCTION OF ISODURENE FROM THE OTHER ISOMERIC TETRAMETHYLBENZENES, WHICH PROCESS COMPRISES CONTACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS A FEED COMPRISING ESSENTIALLY AT LEAST ONE OTHER TETRAMETHYLBENZENE WITH FROM ABOUT 0.9 TO 3 MOLS OF BF3 PER MOL OF SAID TETRAMETHYLBENZENE, AND WITH SUFFICIENT LIQUID HF TO DISSOLVE SAID FEED AND ASSOCIATED BF3, MAINTAINING SAID SOLUTION AT A TEMPERATURE BETWEEN ABOUT 20* AND 100* C. FOR A TIME SUFFICIENT TO REACH AN EQUILIBRIUM COMPOSITION, AND REMOVING HF AND BF3 FROM THE ISODURENE-ENRICHED PRODUCT HYDROCARBONS.
Claim 2
Dependent Claim
86 words
A PROCESS FOR THE PRODUCTION OF ISODURENE FROM THE OTHER ISOMERIC TETRAMETHYLBENZENES, WHICH PROCESS COMPRISES CONTACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS A FEED COMPRISING ESSENTIALLY AT LEAST ONE OTHER TETRAMETHYLBENZENE WITH FROM ABOUT 0.9 TO 3 MOLS OF BF3 PER MOL OF SAID TETRAMETHYLBENZENE, AND WITH SUFFICIENT LIQUID HF TO DISSOLVE SAID FEED AND ASSOCIATED BF3, MAINTAINING SAID SOLUTION AT A TEMPERATURE BETWEEN ABOUT 20* AND 100* C. FOR A TIME SUFFICIENT TO REACH AN EQUILIBRIUM COMPOSITION, AND REMOVING HF AND BF3 FROM THE ISODURENE-ENRICHED PRODUCT HYDROCARBONS.
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) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |