Patent US2857421A successfully refreshed from Google Patents.
US2857421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reclamation of used synthetic lubricating oils
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1954-10-27
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Granted: 1958-10-21
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Expires: 1974-10-27
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Matuszak
- 👤 Jr James W Hand
- 👤 John C Munday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:35
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/34; C07C67/00; C07C67/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A METHOD FOR PREPARING A GLYCOL AND DIESTER FROM A COMPLEX ESTER HAVING THE FORMULA:
Claim 2
Independent Claim
15 words
A METHOD FOR PREPARING A GLYCOL AND DIESTER FROM A COMPLEX ESTER HAVING THE FORMULA:
References Cited (Backward Citations)
US2703811A
Cited
US2392621A
Cited
GB683803A
Cited
US2668848A
Cited
US2695279A
Cited
US2647098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |