US3646142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of polymers
Assignee: Phillips Petroleum Co
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Filing: 1969-11-12
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Granted: 1972-02-29
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Expires: 1989-11-12
Abstract
Abstract A METHOD OF HYDROGENATING BUTADIENE/STYRENE COPOLYMERS TO PRODUCE POUR POINT DEPRESSANTS IS DISCLOSED WHICH INVOLVES DETERMINING THE RATIO BETWEEN THE QUANTITY OF THE TRANS OLEFINIC UNSATURATION IN THE REACTION MIXTURE AND THE QUANTITY OF THE PHENYL GROUP WITHIN THE REACTION MIXTURE AND RECOVERING THE PRODUCT DEPRESSANT WHEN THE RATIO BETWEEN THE TWO QUANTITIES CORRESPONDS TO THE DESIRED POUR POINT EFFECTIVENESS, THE QUANTITATIVE DETERMINATIONS BEING PREFERABLY DETERMINED BY INFRARED ANALYSIS.
Inventors
- 👤 Charles W Strobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:46
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/16; C10L1/1625; C10L1/1633; C10L1/1658; C08; C08C; C08C19/00; C08C19/02; C08F; C08F8/00; C08F8/04; Y; Y10; Y10S; Y10S208/00; Y10S208/01
Claims Analysis
Total Claims: 0
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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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |