US3589978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making water repellent paper using a fatty polyisocyanate and a cationic gum ether and product therefrom
Assignee: General Mills Inc
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Filing: 1967-09-29
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Granted: 1971-06-29
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Expires: 1987-09-29
Abstract
Abstract IN A PROCESS OF MAKING WATER REPELLENT PAPER, INCLUDING THE ADDITION TO THE AQUEOUS DISPERSION OF CELLULOSIC FIBERS OF (1) AN ORGANIC POLYISOCYANATE OF THE FORMULA R-((CH2)YNCO)X WHERE Y IS 0 OR 1, X IS AN INTEGER OF 2 TO ABOUT 4 AND R IS THE HYDROCARBON GROUP OF POLYMERIZED FAT ACIDS DERIVED FROM FAT ACIDS OF 16 TO 22 CARBON ATOMS SUCH AS DIMERYL ISOCYANATE AND (2) A QUATERNARY AMMONIUM POLYGALACTOMANNAN GUM ETHER CATIONIC RETENTION AGENT, FOR EXAMPLE QUATERNARY AMMONIUM GUM ETHER.
Inventors
- 👤 Marwan R Kamal
- 👤 James L Keen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:53
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; D21H17/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |