Patent US2577067A successfully refreshed from Google Patents.
Patent US2537890A successfully refreshed from Google Patents.
US2537890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutralization of high-molecular weight organic esters
Assignee: Eastman Kodak Co
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Filing: 1948-11-24
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Granted: 1951-01-09
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Expires: 1968-11-24
Abstract
No abstract record available.
Inventors
- 👤 William M Gearhart
- 👤 Lester W A Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:30
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/60; C07C67/52; C07C67/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS OF FREEING ORGANIC ESTERS OF MOLECALAR WEIGHT AT LEAST 330, AND RESISTANT TO HYDROLYSIS, FROM ACIDIC SUBSTANCES, WHICH COMPRISES HEATING THE ESTER FOR APPROXIMATELY ONE HOURS AT A TEMPERATURE OF 100-110* C. WITH A 5% SOLUTION OF SODIUM HYDROXIDE, WASHING AT LEAST THREE TIMES WITH WATER, AND DISTILLING THE ESTER IN VACUO.
Claim 2
Dependent Claim
54 words
A PROCESS OF FREEING ORGANIC ESTERS OF MOLECALAR WEIGHT AT LEAST 330, AND RESISTANT TO HYDROLYSIS, FROM ACIDIC SUBSTANCES, WHICH COMPRISES HEATING THE ESTER FOR APPROXIMATELY ONE HOURS AT A TEMPERATURE OF 100-110* C. WITH A 5% SOLUTION OF SODIUM HYDROXIDE, WASHING AT LEAST THREE TIMES WITH WATER, AND DISTILLING THE ESTER IN VACUO.
References Cited (Backward Citations)
US2165450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |