Patent US2689862A successfully refreshed from Google Patents.
US2689862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in color of aryl alkane sulfonates
Assignee: Monsanto Chemicals Ltd
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Filing: 1951-04-20
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Granted: 1954-09-21
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Expires: 1971-04-20
Abstract
No abstract record available.
Inventors
- 👤 William S Knowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:31
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
IN A PROCESS FOR THE IMPROVEMENT IN COLOR OF ARYL ALKANE SULFONATES HAVING THE FORMULA
Claim 2
Dependent Claim
15 words
IN A PROCESS FOR THE IMPROVEMENT IN COLOR OF ARYL ALKANE SULFONATES HAVING THE FORMULA
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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |