Patent US2573779A successfully refreshed from Google Patents.
US2573779A
Expired / Lapsed
US
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Color stabilizers
Assignee: Shell Development Co
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Filing: 1944-04-10
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Granted: 1951-11-06
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Expires: 1964-04-10
Abstract
No abstract record available.
Inventors
- 👤 Ernest L Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:11
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/182; C10L1/183; C10L1/1832; C10L1/22; C10L1/222; C10L1/2222; C10L1/223; C10L1/228; C10L1/2283; C10L1/232
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
40 words
A COMPOSITION OF MATTER COMPRISING A PREDOMINANT AMOUNT OF AN AROMATIC AMINE IN CONTACT WITH A MINOR AMOUNT, SUFFICIENT TO PREVENT COLOR DETERIORATION OF SAID AROMATIC AMINE, OF DISALICYAL ETHYLENE DIAMINE AND AN OXIDATION INHIBITING AMOUNT OF 2,4-DIMETHYL-6-TERTIARY BUTYL PHENOL.
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) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |