US3223543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper sizing emulsion
Assignee: Wyeth Holdings LLC
•
Filing: 1961-05-26
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Granted: 1965-12-14
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Expires: 1981-05-26
Abstract
No abstract record available.
Inventors
- 👤 Savina Anthony Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:22
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/48; D21H17/03; D21H17/05; D21H17/14; D21H17/15; D21H17/21; D21H17/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN THE MANUFACTURE OF A DISPERSION OF A HYDROPHOBIC CELLULOSE-REACTIVE PAPER-SIZING FATTY AMHYDRIDE WHEREIN SAID ANHYDRIDE IS EMULSIFIED IN AQUEOUS MEDIUM WHICH HAS A TEMPERATURE ABOVE THE MELTING POINT OF SAID ANHYDRIDE AND WHICH CONTAINS AT LEAST SUFFICIENT OF A WATER-SOLUBLE CATIONIC STARCH TO RENDER THE ANHYDRIDE CELLULOSE-SUBSTANTIVE, THE IMPROVEMENT WHICH CONSISTS IN ADDING TO SAID AQUEOUS MEDIUM PRIOR TO SAID EMULSIFICATION A SMALL AMOUNT OF AN ANIONIC MATERIAL SEELCTED FROM THE GROUP CONSISTING OF SODIUM LIGNOSULFONATE, SODIUM FORMALDEHYDE-CONDENSED NAPHTHALENESULFONATE, AND MISTURES THEREOF, AS AGENT INHIBITING FORMATION OF ANHYDRIDE AGGREGATES.
Claim 2
Dependent Claim
90 words
IN THE MANUFACTURE OF A DISPERSION OF A HYDROPHOBIC CELLULOSE-REACTIVE PAPER-SIZING FATTY AMHYDRIDE WHEREIN SAID ANHYDRIDE IS EMULSIFIED IN AQUEOUS MEDIUM WHICH HAS A TEMPERATURE ABOVE THE MELTING POINT OF SAID ANHYDRIDE AND WHICH CONTAINS AT LEAST SUFFICIENT OF A WATER-SOLUBLE CATIONIC STARCH TO RENDER THE ANHYDRIDE CELLULOSE-SUBSTANTIVE, THE IMPROVEMENT WHICH CONSISTS IN ADDING TO SAID AQUEOUS MEDIUM PRIOR TO SAID EMULSIFICATION A SMALL AMOUNT OF AN ANIONIC MATERIAL SEELCTED FROM THE GROUP CONSISTING OF SODIUM LIGNOSULFONATE, SODIUM FORMALDEHYDE-CONDENSED NAPHTHALENESULFONATE, AND MISTURES THEREOF, AS AGENT INHIBITING FORMATION OF ANHYDRIDE AGGREGATES.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |