Patent US5084749A successfully refreshed from Google Patents.
Patent US2939831A successfully refreshed from Google Patents.
US2939831A
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Process of improving lubricating oils
Assignee: Hoechst AG
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Filing: 1956-10-02
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Granted: 1960-06-07
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Expires: 1976-10-02
Abstract
No abstract record available.
Inventors
- 👤 Lange Joachim
- 👤 Theilig Gerhard
- 👤 Zorn Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:15
CPC Classifications
C; C10; C10M; C10M143/00; C10M143/02; C08; C08F; C08F110/00; C08F110/02; C10M2205/00; C10M2205/02; C10M2205/022; C10N; C10N2030/00; C10N2030/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS FOR THE PREPARATION OF AN IMPROVED LUBRICANT WHICH COMPRISES CONTACTING A MINERAL OIL LUBRICANT WITH ETHYLENE UNDER SUPERATMOSPHERIC PRESSURE AND ELEVATED TEMPERATURE IN THE PRESENCE OF A FREE-RADICAL POLYMERIZATION INITIATOR, WHEREBY THE VISCOSITY INDEX AND LUBRICATING PROPERTIES OF THE LUBRICANT ARE SUBSTANTIALLY IMPROVED.
Claim 2
Dependent Claim
45 words
A PROCESS FOR THE PREPARATION OF AN IMPROVED LUBRICANT WHICH COMPRISES CONTACTING A MINERAL OIL LUBRICANT WITH ETHYLENE UNDER SUPERATMOSPHERIC PRESSURE AND ELEVATED TEMPERATURE IN THE PRESENCE OF A FREE-RADICAL POLYMERIZATION INITIATOR, WHEREBY THE VISCOSITY INDEX AND LUBRICATING PROPERTIES OF THE LUBRICANT ARE SUBSTANTIALLY IMPROVED.
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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |