US2614120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
beta-hydroxyalkyl diesters of dicarboxydiphenyl sulfones and method of preparing same
Assignee: Eastman Kodak Co
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Filing: 1950-02-10
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Granted: 1952-10-14
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Expires: 1970-02-10
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
C; C07; C07C; C07C315/00; C07C315/04; C07C317/00; C07C317/44
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
A PROCESS FOR PREPARING A B-HYDROXYALKYL DIESTER OF A DICARBOXYDIPHENYL SULFONE BY REACTING A DICARBOXYDIPHENYL SULFONE HAVING THE FOLLOWING FORMULA:
References Cited (Backward Citations)
US2197880A
Cited
US2342142A
Cited
US2465319A
Cited
US2380685A
Cited
US2410073A
Cited
US2461740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-14 | 1956-04-14 | 1956-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-14 | 1960-04-14 | 1960-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-14 | 1964-04-14 | 1964-10-14 | $7700.00 | Window Closed / Lapsed |