Patent US2681935A successfully refreshed from Google Patents.
US2681935A
Expired / Lapsed
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Stabilization of aryl amino compounds
Assignee: Universal Oil Products Co
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Filing: 1951-09-28
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Granted: 1954-06-22
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Expires: 1971-09-28
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:01
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/82; C07C209/90; C07C213/00; C07C213/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A METHOD OF STABILIZING AN ARYL AMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHENYLENE DIAMINES AND AMINOPHENOLS WHICH COMPRISES ADDING THERETO FROM ABOUT 0.0001% TO ABOUT 10% BY WEIGHT OF A COMPOUND HAVING THE GENERAL FORMULA:
Claim 2
Independent Claim
37 words
A METHOD OF STABILIZING AN ARYL AMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHENYLENE DIAMINES AND AMINOPHENOLS WHICH COMPRISES ADDING THERETO FROM ABOUT 0.0001% TO ABOUT 10% BY WEIGHT OF A COMPOUND HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US2181122A
Cited
US2256753A
Cited
US2370552A
Cited
US2498630A
Cited
US2521425A
Cited
US2512297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |