US2673218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing sulfonyl dibenzoic acids and derivatives thereof
Assignee: Eastman Kodak Co
•
Filing: 1952-05-24
•
Granted: 1954-03-23
•
Expires: 1972-05-24
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:18
CPC Classifications
C; C07; C07C; C07C315/00; C07C315/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A PROCESS FOR PREPARING A CARBOXY SUBSTITUTED DIPHENYL SULFONE WHICH COMPRISES REACTING AT A TEMPERATURE OF FROM ABOUT 80* C. TO ABOUT 110* C. A SUBSTITUTED DIPHENYL SULFONE SELECTED FROM THE GROUP CONSISTING OF THOSE COMPOUNDS HAVING THE FOLLOWING FORMULAS:
Claim 2
Dependent Claim
40 words
A PROCESS FOR PREPARING A CARBOXY SUBSTITUTED DIPHENYL SULFONE WHICH COMPRISES REACTING AT A TEMPERATURE OF FROM ABOUT 80* C. TO ABOUT 110* C. A SUBSTITUTED DIPHENYL SULFONE SELECTED FROM THE GROUP CONSISTING OF THOSE COMPOUNDS HAVING THE FOLLOWING FORMULAS:
References Cited (Backward Citations)
US2245528A
Cited
US2588388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |