Patent US2811519A successfully refreshed from Google Patents.
US2811519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed cellulose ethers and their preparation
Assignee: Eastman Kodak Co
•
Filing: 1954-02-05
•
Granted: 1957-10-29
•
Expires: 1974-02-05
Abstract
No abstract record available.
Inventors
- 👤 George P Touey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:20
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A METHOD OF PRODUCING A WATER SOLUBLE CARBOXYMETHYL CELLULOSE WHICH WILL NOT PRECIPITATE FROM ITS AQUEOUS SOLUTIONS ON THE ADDITION OF STRONG ACIDS OR OF POLYVALENT METAL IONS WHICH CONSISTS OF INTRODUCING 0.1-0.3 SULFOETHYL GROUPS PER C6 CELLULOSE UNIT INTO A CARBOXYMETHYL CELLULOSE CONTAINING 0.25-2.50 CARBOXYMETHYL GROUPS PER C6 CELLULOSE UNIT.
Claim 2
Independent Claim
51 words
A METHOD OF PRODUCING A WATER SOLUBLE CARBOXYMETHYL CELLULOSE WHICH WILL NOT PRECIPITATE FROM ITS AQUEOUS SOLUTIONS ON THE ADDITION OF STRONG ACIDS OR OF POLYVALENT METAL IONS WHICH CONSISTS OF INTRODUCING 0.1-0.3 SULFOETHYL GROUPS PER C6 CELLULOSE UNIT INTO A CARBOXYMETHYL CELLULOSE CONTAINING 0.25-2.50 CARBOXYMETHYL GROUPS PER C6 CELLULOSE UNIT.
References Cited (Backward Citations)
US2132181A
Cited
US2510153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |