US3142532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making polyvinyl alcohol fibers
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1960-05-26
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Granted: 1964-07-28
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Expires: 1980-05-26
Abstract
No abstract record available.
Inventors
- 👤 Fukushima Osamu
- 👤 Kurashige Hirotoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:56
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14; C; C08; C08L; C08L29/00; C08L29/02; C08L29/04; D01F1/00; D01F1/02; D01F1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS OF PRODUCING FIBERS OF POLYVINYL ALCOHOL OF IMPROVED PROPERTIES WHICH COMPRISES ADDING TO AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL, WATER-INSOLUBLE DERIVATIVES OF POLYVINYL ALCOHOL IN FINELY-DIVIDED FORM, MIXING AND DISTRIBUTING SAID DERIVATIVES IN SAID SOLUTION AND SPINNING SAID FIBERS FROM THE RESULTANT SPINNING SOLUTION, SAID DERIVATIVES CONTAINING MORE THAN 0.2% BASIC NITROGEN AND BEING THE PRODUCTS RESULTING FROM REACTION OF POLYVINYL ALCOHOL WITH AN ALDEHYDE CONTAINING NO BASIC NITROGEN AND WITH A MEMBER OF THE GROUP CONSISTING OF ETHYLENE-IMINE, THE REACTION PRODUCT OF ETHYLENE-IMINE AND MELAMINE, AND THE REACTION PRODUCT OF EPICHLORHYDRIN AND AN ALKYL SECONDARY AMINE, AND ACETALIZING SAID FIBERS.
Claim 2
Dependent Claim
103 words
A PROCESS OF PRODUCING FIBERS OF POLYVINYL ALCOHOL OF IMPROVED PROPERTIES WHICH COMPRISES ADDING TO AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL, WATER-INSOLUBLE DERIVATIVES OF POLYVINYL ALCOHOL IN FINELY-DIVIDED FORM, MIXING AND DISTRIBUTING SAID DERIVATIVES IN SAID SOLUTION AND SPINNING SAID FIBERS FROM THE RESULTANT SPINNING SOLUTION, SAID DERIVATIVES CONTAINING MORE THAN 0.2% BASIC NITROGEN AND BEING THE PRODUCTS RESULTING FROM REACTION OF POLYVINYL ALCOHOL WITH AN ALDEHYDE CONTAINING NO BASIC NITROGEN AND WITH A MEMBER OF THE GROUP CONSISTING OF ETHYLENE-IMINE, THE REACTION PRODUCT OF ETHYLENE-IMINE AND MELAMINE, AND THE REACTION PRODUCT OF EPICHLORHYDRIN AND AN ALKYL SECONDARY AMINE, AND ACETALIZING SAID FIBERS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |