US2865898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of salts of dicarboxylic acid esters
Assignee: Eastman Kodak Co
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Filing: 1955-08-24
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Granted: 1958-12-23
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Expires: 1975-08-24
Abstract
No abstract record available.
Inventors
- 👤 Gordon D Hiatt
- 👤 Emerson John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:42
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A METHOD OF PREPARING THE SALT OF AN ESTER SELECTED FROM THE GROUP CONSISTING OF THE CELLULOSE AND POLYVINYL PHTHALATES, SUCCINATES AND MALEATES, BOTH SIMPLE AND MIXED ESTERS, WHICH COMPRISES DISPERSING THE ACID FORM OF THE ESTER IN AN ALIPHATIC MONOHYDROXY ALCOHOL OF 2-4 CARBON ATOMS CONTAINING AN AMOUNT OF WATER, WITHIN THE RANGE OF 3-22%, INSUFFICIENT TO EXERT A SOFTENING EFFECT ON THE ESTER, ADDING THERETO AN ALKALINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL, AMMONIUM AND ALIPHATIC AMINE BASES IN AN AMOUNT ONLY SUFFICIENT TO REACT WITH THE CARBOXYL GROUPS OF THE ESTER AND SEPARATING THE SOLID PRODUCT THUS OBTAINED FROM THE LIQUID PORTION OF THE MASS.
Claim 2
Independent Claim
111 words
A METHOD OF PREPARING THE SALT OF AN ESTER SELECTED FROM THE GROUP CONSISTING OF THE CELLULOSE AND POLYVINYL PHTHALATES, SUCCINATES AND MALEATES, BOTH SIMPLE AND MIXED ESTERS, WHICH COMPRISES DISPERSING THE ACID FORM OF THE ESTER IN AN ALIPHATIC MONOHYDROXY ALCOHOL OF 2-4 CARBON ATOMS CONTAINING AN AMOUNT OF WATER, WITHIN THE RANGE OF 3-22%, INSUFFICIENT TO EXERT A SOFTENING EFFECT ON THE ESTER, ADDING THERETO AN ALKALINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL, AMMONIUM AND ALIPHATIC AMINE BASES IN AN AMOUNT ONLY SUFFICIENT TO REACT WITH THE CARBOXYL GROUPS OF THE ESTER AND SEPARATING THE SOLID PRODUCT THUS OBTAINED FROM THE LIQUID PORTION OF THE MASS.
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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |