US2992156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating paper prepared from partially acetylated cellulose fibers
Assignee: Eastman Kodak Co
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Filing: 1958-03-03
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Granted: 1961-07-11
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Expires: 1978-03-03
Abstract
No abstract record available.
Inventors
- 👤 Oliver J Schulwitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:33
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H11/00; D21H11/16; D21H11/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
A METHOD OF PREPARING CHARACTERIZED BY GOOD WET STRENGTH, FLEXIBLITY AND MULLEN VALUES WHICH COMPRISES PREPARING SHEET FROM AN AQUEOUS SLURRY FORMES BY BEATING PARTIALLY ACETYLATED CELLULOSE FIBER HAVING AN ACETYL CONTENT OF 15-30% IN WATER, WETTING THE PAPER THUS FORMED WITH METHYLENE CHLORIDE FOLLOWED BY PRESSING THE SO TREATED PAPER AND REMOVING THE METHYLAENE CHLORIDE THEREFROM.
References Cited (Backward Citations)
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Cited
US2054284A
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US2208652A
Cited
US2282415A
Cited
US2357962A
Cited
US2365297A
Cited
US2930106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |