US3172856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of n-alkyl piperazine acry- late and alkyl acrylate and lubricat- ing oils containing them
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
•
Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:23
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
THE COMPOSITION CONSISTING ESSENTIALY OF A MINERAL OIL OF LUBRICATING VISCOSITY HAVING INCORPORATED THEREIN ABOUT .1 TO 20% BY WEIGHT OF AN OIL-SOLUBLE COPOLYMER OF AN ESTER OF AN ALKANOL OF ABOUT 10 TO 20 CARBON ATOMS AND ACRYLIC ACID AND AN N-ALKYL PIPERAZINE ESTER OF ACRYLIC ACID, SAID ALKYL GROUP BEING A LOWER ALKYL GROUP, SAID COPOLYMER HAVING THE ESTER OF ACRYLIC ACID AND THE N-ALKYL PIPERAZINE ESTER IN A MOL RATIO OF ABOUT 75:25 TO 99:1 AND A NITROGEN CONTENT OF ABOUT 0.1 TO 7.
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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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |