Patent US3471540A successfully refreshed from Google Patents.
US3471540A
Expired / Lapsed
US
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Production of metal salts of dihydrocarbyldithiophosphoric acids
Assignee: Phillips Petroleum Co
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Filing: 1967-03-22
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Granted: 1969-10-07
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Expires: 1987-03-22
Abstract
No abstract record available.
Inventors
- 👤 Harold C Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:28
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165; C07F9/17; C10; C10M; C10M137/00; C10M137/02; C10M137/04; C10M137/10; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1949956A
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US3163670A
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US3168497A
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US3290347A
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US3351647A
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US3347790A
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US3361668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |