US2685508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High wet strength paper and its preparation
Assignee: Eastman Kodak Co
•
Filing: 1950-12-01
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Granted: 1954-08-03
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Expires: 1970-12-01
Abstract
No abstract record available.
Inventors
- 👤 Donald R Spear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:14
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/31; D21H17/32; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/51; G; G03; G03C; G03C1/00; G03C1/76; G03C1/775
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD OF PREPARING PAPER ADAPTED FOR USE AS A BASE FOR PHOTOGRAPHIC PAPER WHICH INCLUDES ADDING TO THE PULP SLURRY FROM WHICH THE PAPER IS PREPARED MELAMINE FORMALDEHYDE RESIN AND OXIDIZED GUAR PRIOR TO FORMING THE PAPER WEB ON THE PAPER RESIN, THE OR BEING ADDED IN THE PROPORTION TO .225-2% AND THE LATTER OF 1/2-2% BASED ON THE NONE DRY WEIGHT OF THE CELLULOSE.
Claim 2
Independent Claim
66 words
A METHOD OF PREPARING PAPER ADAPTED FOR USE AS A BASE FOR PHOTOGRAPHIC PAPER WHICH INCLUDES ADDING TO THE PULP SLURRY FROM WHICH THE PAPER IS PREPARED MELAMINE FORMALDEHYDE RESIN AND OXIDIZED GUAR PRIOR TO FORMING THE PAPER WEB ON THE PAPER RESIN, THE OR BEING ADDED IN THE PROPORTION TO .225-2% AND THE LATTER OF 1/2-2% BASED ON THE NONE DRY WEIGHT OF THE CELLULOSE.
References Cited (Backward Citations)
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US2325302A
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US2291080A
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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) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |