Patent US3291731A successfully refreshed from Google Patents.
US3291731A
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Incorporating sodium nitrite into lubricant compositions
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1965-07-28
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Granted: 1966-12-13
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Expires: 1985-07-28
Abstract
No abstract record available.
Inventors
- 👤 Richard P Crowley
- 👤 Arnold J Morway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:14
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/12; C07D295/125; C07D295/13; C07D233/00; C07D233/04; C07D233/06; C07D233/08; C07D233/12; C07D233/14; C08; C08F; C08F8/00; C08F8/48; C08L; C08L35/00; C08L35/06; C10; C10M; C10M5/00; C10M2201/00; C10M2201/04; C10M2201/041; C10M2201/08; C10M2201/082; C10M2201/083; C10M2201/10; C10M2201/105; C10M2205/00; C10M2205/02; C10M2205/026; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/122; C10M2207/125; C10M2207/128; C10M2207/129; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/086; C10M2215/24; C10M2215/28; C10N; C10N2010/00; C10N2010/04; C10N2040/00; C10N2040/02; C10N2050/00; C10N2050/10; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A LUBRICANT COMPOSITION COMPRISING A MAJOR PROPORTION OF A LUBRICATING OIL, A THICKENING AMOUNT OF A GREASE THICKENER, AND FROM 0.1 TO 10WT, PERCENT OF A DISPERSION OF SODIUM NITRITE IN AN IMIDE FORMED BY REACTION OF A COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE OF FROM 400 TO 3000 MOLECULAR WEIGHT WITH AN AMINO COMPOUND HAVING FROM 2 TO ABOUT 35 CARBON ATOMS AND FROM 2 TO 5 NITROGEN ATOMS, AT LEAST ONE OF WHICH IS IN A PRIMARY AMINO GROUP, THERE BEING FROM ABOUT 0.5 TO 5 PARTS BY WEIGHT OF THE IMIDE PER PART OF SODIUM NITRITE, SAID AMINO COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF ALKYLENE POLLYAMINES, N-AMINOALKYL PIPERAZINES OF THE FORMULA:
Claim 2
Dependent Claim
116 words
A LUBRICANT COMPOSITION COMPRISING A MAJOR PROPORTION OF A LUBRICATING OIL, A THICKENING AMOUNT OF A GREASE THICKENER, AND FROM 0.1 TO 10WT, PERCENT OF A DISPERSION OF SODIUM NITRITE IN AN IMIDE FORMED BY REACTION OF A COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE OF FROM 400 TO 3000 MOLECULAR WEIGHT WITH AN AMINO COMPOUND HAVING FROM 2 TO ABOUT 35 CARBON ATOMS AND FROM 2 TO 5 NITROGEN ATOMS, AT LEAST ONE OF WHICH IS IN A PRIMARY AMINO GROUP, THERE BEING FROM ABOUT 0.5 TO 5 PARTS BY WEIGHT OF THE IMIDE PER PART OF SODIUM NITRITE, SAID AMINO COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF ALKYLENE POLLYAMINES, N-AMINOALKYL PIPERAZINES OF THE FORMULA:
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) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |