Patent US2652340A successfully refreshed from Google Patents.
US2652340A
Expired / Lapsed
US
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Stabilized cellulose lower alkanoates
Assignee: Eastman Kodak Co
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Filing: 1949-06-04
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Granted: 1953-09-15
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Expires: 1969-06-04
Abstract
No abstract record available.
Inventors
- 👤 Gordon D Hiatt
- 👤 Robert F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:41
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/22; C08B3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A LOWER FATTY ACID ESTER OF CELLULOSE CONTAINING .05-5 HYDROXYLS PER C6 UNIT OF CELLULOSE, WHICH ESTER HAS SULFUR CONTENT OF .001-.015% IN WHICH HAS ASH CONTENT OF NOT MORE THAN .05% IN WHICH HAS BEEN INCORPORATED AN ALKALI METAL ACID SALT ON AN ACID SELECTED FROM A GROUP CONSISTING OF OXALIC. MALIC AND TARTARIC IN THE AMOUNT OF 1-3 MOLECULAR EQUIVALENTS OF THE SALT PER EQUIVALENT OF SULFATE ION IN THE ESTER WHEREBY THE CELLULOSE ESTER IS STABILIZED AGAINST THE EFFECTS OF ELEVATED TEMPERATURES.
Claim 2
Dependent Claim
85 words
A LOWER FATTY ACID ESTER OF CELLULOSE CONTAINING .05-5 HYDROXYLS PER C6 UNIT OF CELLULOSE, WHICH ESTER HAS SULFUR CONTENT OF .001-.015% IN WHICH HAS ASH CONTENT OF NOT MORE THAN .05% IN WHICH HAS BEEN INCORPORATED AN ALKALI METAL ACID SALT ON AN ACID SELECTED FROM A GROUP CONSISTING OF OXALIC. MALIC AND TARTARIC IN THE AMOUNT OF 1-3 MOLECULAR EQUIVALENTS OF THE SALT PER EQUIVALENT OF SULFATE ION IN THE ESTER WHEREBY THE CELLULOSE ESTER IS STABILIZED AGAINST THE EFFECTS OF ELEVATED TEMPERATURES.
References Cited (Backward Citations)
US1607474A
Cited
US1921949A
Cited
US2154822A
Cited
US2091972A
Cited
US2265218A
Cited
US2361500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |