Patent US2983742A successfully refreshed from Google Patents.
US2983742A
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US
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Decolorizing and improving metal salts of partial esters of dithiophosphoric acids
Assignee: Gulf Oil Corp
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Filing: 1959-03-11
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Granted: 1961-05-09
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Expires: 1979-03-11
Abstract
No abstract record available.
Inventors
- 👤 Boba Joseph
- 👤 Charles H Kolker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:04
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/025; B; B21; B21D; B21D26/00; B21D26/02; B21D26/06; B21D26/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
A COMPOSITION COMPRISING A MAJOR PROPORTION OF A METAL SALT OF A PARTIAL ESTER OF DITHIOPHOSPHORIC ACID THAT CONTAINS AN OBJECTIONABLE PROPORTION OF COLOR-FORMING COMPONENTS, AND HAVING COMBINED THEREWITH A SMALL AMOUNT, SUFFICIENT TO REDUCE THE COLOR OF THE SALT, OF A TRIALKYLOLAMINE WHOSE ALKYLOL GROUPS EACH CONTAIN 1 TO 4 CARBON ATOMS, SAID SMALL AMOUNT BEING NOT GREATER THAN ABOUT 1.0 PERCENT BY WEIGHT OF SAID SALT.
References Cited (Backward Citations)
US2737492A
Cited
US2837549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |