Patent US2291366A successfully refreshed from Google Patents.
Patent US3084990A successfully refreshed from Google Patents.
US3084990A
Expired / Lapsed
US
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Shaped articles of modified cellulose esters
Assignee: EIDP Inc
•
Filing: 1958-08-08
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Granted: 1963-04-09
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Expires: 1978-08-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Henry Allen Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:32
CPC Classifications
C; C08; C08B; C08B7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A SHAPED ARTICLE CONSISTING ESSENTIALLY OF CELLULOSE ACETATE HAVING ATTACHED TO THE POLYMER CHAIN THROUGH ESTER LINKAGES FROM 10 TO 800 MILLIEQUVALENTS OF A GROUP SELECTED FROM THE CLASS CONSISTING OF SULFONIC ACID AND HYDROLYZABLE SALTS THEREOF PER KILOGRAM OF PRODUCT.
Claim 2
Dependent Claim
41 words
A SHAPED ARTICLE CONSISTING ESSENTIALLY OF CELLULOSE ACETATE HAVING ATTACHED TO THE POLYMER CHAIN THROUGH ESTER LINKAGES FROM 10 TO 800 MILLIEQUVALENTS OF A GROUP SELECTED FROM THE CLASS CONSISTING OF SULFONIC ACID AND HYDROLYZABLE SALTS THEREOF PER KILOGRAM OF PRODUCT.
References Cited (Backward Citations)
US1833286A
Cited
US1933815A
Cited
US2127236A
Cited
US2492977A
Cited
US2849330A
Cited
US3019119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |