US2643954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkoxyalkyl esters of bis (4-carboxyphenyl) sulfone and cellulose esters plasticizedtherewith
Assignee: Eastman Kodak Co
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Filing: 1949-12-21
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Granted: 1953-06-30
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Expires: 1969-12-21
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:41
CPC Classifications
C; C07; C07C; C07C317/00; C07C317/44; C08; C08K; C08K5/00; C08K5/36; C08K5/41
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
10 words
ALKOXYALKYL ESTERS OF BIS (4-CARBOXYPHENYL) SULFONES HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
10 words
ALKOXYALKYL ESTERS OF BIS (4-CARBOXYPHENYL) SULFONES HAVING THE GENERAL FORMULA:
Claim 3
Dependent Claim
34 words
A PLASTIC COMPOSITION COMPRISING A LOWER ALKANOIC ACID ESTER OF CELLULOSE PLATICIZED WITH FROM 15 TO 60 PER CENT BY WEIGHT THEROF OF AN ALKOXYALKYL ESTER OF BIS (4-CRBOXYPHENYL) SULFONE HAVING THE GENERAL FORMULA:
Claim 4
Dependent Claim
34 words
A PLASTIC COMPOSITION COMPRISING A LOWER ALKANOIC ACID ESTER OF CELLULOSE PLATICIZED WITH FROM 15 TO 60 PER CENT BY WEIGHT THEROF OF AN ALKOXYALKYL ESTER OF BIS (4-CRBOXYPHENYL) SULFONE HAVING THE GENERAL 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) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |