US2675367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis(4-beta-hydroxyalkoxyphenyl) ketones and polyesters prepared therefrom
Assignee: Eastman Kodak Co
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Filing: 1951-04-11
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Granted: 1954-04-13
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Expires: 1971-04-11
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:58
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR PREPARING POLYESTERS COMPRISING REACTING AT A TEMPERATURE OF FROM ABOUT 125* C. TO ABOUT 275* C. IN THE PRESENCE OF A CONDENSING AGENT, A DICARBOXYL COMPOUND CONTAINING FROM 4 TO 10 CARBON ATOMS SELECTED FROM THE GROUP CONSISTING OF THE SATURATED AND UNSATURATED ALIPHATIC DICARBOXYLIC ACIDS AND THE MONOCYCLIC DICARBOXYLIC AROMATIC ACIDS AND THE ANHYDRIDES AND LOWER ALKYL ESTERS OF EACH OF THESE ACIDS, WITH BIS (4-B-HYDROXYETHOXYPHENYL KETONE.
Claim 2
Dependent Claim
71 words
A PROCESS FOR PREPARING POLYESTERS COMPRISING REACTING AT A TEMPERATURE OF FROM ABOUT 125* C. TO ABOUT 275* C. IN THE PRESENCE OF A CONDENSING AGENT, A DICARBOXYL COMPOUND CONTAINING FROM 4 TO 10 CARBON ATOMS SELECTED FROM THE GROUP CONSISTING OF THE SATURATED AND UNSATURATED ALIPHATIC DICARBOXYLIC ACIDS AND THE MONOCYCLIC DICARBOXYLIC AROMATIC ACIDS AND THE ANHYDRIDES AND LOWER ALKYL ESTERS OF EACH OF THESE ACIDS, WITH BIS (4-B-HYDROXYETHOXYPHENYL KETONE.
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) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |