US2811548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying aromatic dicarboxylic acids
Assignee: Solutia Inc
•
Filing: 1954-07-30
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Granted: 1957-10-29
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Expires: 1974-07-30
Abstract
No abstract record available.
Inventors
- 👤 George E Ham
- 👤 Arthur B Beindorff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:40
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A PROCESS FOR PURIFYING AROMATIC DICARBOXYLIC ACIDS HAVING THE FORMULA:
Claim 2
Dependent Claim
10 words
A PROCESS FOR PURIFYING AROMATIC DICARBOXYLIC ACIDS 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) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |