US3496224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of sulfonic acids
Assignee: Union Oil Company of California
•
Filing: 1966-09-13
•
Granted: 1970-02-17
•
Expires: 1986-09-13
Abstract
No abstract record available.
Inventors
- 👤 George W Ayers
- 👤 William A Krewer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:59
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; B; B01; B01J; B01J39/00; B01J39/04; B01J39/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1564239A
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US2463677A
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US2572344A
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US2615924A
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US2775621A
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US2878182A
Cited
US2897238A
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US3025135A
Cited
US3030410A
Cited
US3030411A
Cited
US3252897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |