Patent US3022328A successfully refreshed from Google Patents.
US3022328A
Expired / Lapsed
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Separation of isomers of tolylene diisocyanate
Assignee: Phillips Petroleum Co
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Filing: 1958-05-09
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Granted: 1962-02-20
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Expires: 1978-05-09
Abstract
No abstract record available.
Inventors
- 👤 Raymond L Cobb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:57
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/18; C07C263/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR SEPARATING TOLYLENE DIISOCYANATE ISOMERS WHICH COMPRISES REACTING A MIXTURE CONTAINING THE 2,6-ISOMER OF TOLYLENE DIISOCYANATE, AT LEAST ONE TOLYLENE DIISOCYANATE ISOMER SELECTED FROM THE GROUP CONSISTING OF ISOMERS HAVING AN ISOCYANATE GROUP IN THE 3,4 AND 5 POSITION WITH RESPECT TO THE METHY GROUP AND AT LEAST ONE ALCOHOL CONTAINING 4 TO 14 CARBON ATOMS AND REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
63 words
A PROCESS FOR SEPARATING TOLYLENE DIISOCYANATE ISOMERS WHICH COMPRISES REACTING A MIXTURE CONTAINING THE 2,6-ISOMER OF TOLYLENE DIISOCYANATE, AT LEAST ONE TOLYLENE DIISOCYANATE ISOMER SELECTED FROM THE GROUP CONSISTING OF ISOMERS HAVING AN ISOCYANATE GROUP IN THE 3,4 AND 5 POSITION WITH RESPECT TO THE METHY GROUP AND AT LEAST ONE ALCOHOL CONTAINING 4 TO 14 CARBON ATOMS AND REPRESENTED BY THE FORMULA
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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |