US3730830A
Expired / Lapsed
US
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Process for making paper
Assignee: Eastman Kodak Co
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Filing: 1971-11-24
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Granted: 1973-05-01
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Expires: 1991-11-24
Abstract
Abstract PAPER PARTICULARLY USEFUL AS PHOTOGRAPHIC PAPER BASE IS MADE BY PREPARING A SLURRY IN WATER OF A MIXTURE OF A SYNTHETIC POLYMER STAPLE FIBER, SUCH AS A LINEAR POLYESTER, CARBOXYMETHYL CELLULOSE AND AN INORGANIC PIGMENT SUCH AS TITANIUM DIOXIDE OR CLAY OR CARBON, BLENDING THE SLURRY WITH CELLULOSE FIBER BEFORE OR AFTER REFINING THE CELLULOSE FIBER AND FORMING A SHEET OF PAPER FROM THE BLEND. THE INORGANIC PIGMENT TENDS TO PREVENT AGGLOMERATION OF THE POLYMER FIBERS AND ALLOWS A POLYMER SLURRY OF RELATIVELY HIGH CONSISTENCY TO BE PREPARED FOR BLENDING WITH THE CELLULOSE FIBERS.
Inventors
- 👤 W Driscoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:16
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/1254; D21H13/00; D21H13/10; D21H13/12; D21H13/14; D21H17/00; D21H17/63; D21H17/67
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |