US3784645A
Expired / Lapsed
US
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Method for treating nitrogen-containing polymeric dispersants
Assignee: Texaco Inc
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Filing: 1971-11-12
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Granted: 1974-01-08
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Expires: 1991-11-12
Abstract
Abstract METHOD FOR TREATING NITROGEN-CONTAINING POLYMERIC DISPERSANTS FOR MINERAL LUBRICATING OIL COMPOSITIONS COMPRISING ADMIXING THE DISPERSANT WITH A PARTICULATE METAL REACTIVE WITH THE UNSTABLE MATERIALS PRESENT IN THE DISPERSANT, HEATING THE MIXTURE AT A TEMPERATURE IN THE RANGE FROM ABOUT 200 TO 400*C., SEPARATING A METALCONTAINING LAYER, EXTRACTING THE TREATED DISPERSANT WITH A LOWER ALIPHATIC ALCOHOL AND RECOVERING A DISPERSANT OF IMPROVED THERMAL STABILITY.
Inventors
- 👤 H Chafetz
- 👤 E Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:55
CPC Classifications
C; C10; C10M; C10M133/00; C10M133/52; C10M133/56; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/08; C10M2215/082; C10M2215/086; C10M2215/12; C10M2215/14; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/28; C10M2215/30; C10M2217/00; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |