Patent US2768211A successfully refreshed from Google Patents.
US2768211A
Expired / Lapsed
US
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Process for preparing diarylsulfones
Assignee: Eastman Kodak Co
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Filing: 1953-07-14
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Granted: 1956-10-23
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Expires: 1973-07-14
Abstract
No abstract record available.
Inventors
- 👤 Edmund B Towne
- 👤 Hubert M Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:05
CPC Classifications
C; C07; C07C; C07C317/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A PROCESS FOR PREPARING A DIARYLSULFONE HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
10 words
A PROCESS FOR PREPARING A DIARYLSULFONE HAVING THE FOLLOWING 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) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |