Patent US2828339A successfully refreshed from Google Patents.
US2828339A
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US
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P,p'-sulfonyldibenzoic acid derivatives and their preparation
Assignee: Eastman Kodak Co
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Filing: 1953-10-27
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Granted: 1958-03-25
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Expires: 1973-10-27
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
- 👤 William R Kingdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:52
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/44; C07D213/46; C07D213/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A MONOMERIC COMPOUND CONTAINING AT LEAST 18 AND NOT MORE THAN 26 CARBON ATOMS AND HAVING THE FORMULA:
Claim 2
Dependent Claim
18 words
A MONOMERIC COMPOUND CONTAINING AT LEAST 18 AND NOT MORE THAN 26 CARBON ATOMS AND 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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |