US2610359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polyvinyl alcohol filaments of improved properties
Assignee: EIDP Inc
•
Filing: 1950-04-22
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Granted: 1952-09-16
•
Expires: 1970-04-22
Abstract
No abstract record available.
Inventors
- 👤 William R Hatchard
- 👤 Julian W Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:37
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14; Y; Y10; Y10S; Y10S264/00; Y10S264/71; Y10S8/00; Y10S8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR THE PREPARATION OF IMPROVED POLYVINYL ALCOHOL FIBERS WHICH COMPRISES POLYMERIZING VINYL FORMATE IN A LIQUID DILUENT MISCIBLE WITH VINYL FORMATE MONOMER, INTERRUPTING THE POLYMERIZATION (A) BEFORE THE CONCENTRATION OF THE POLYMER IN THE POLYMERIZATION MIXTURE EXCEEDS 60% OF THE WEIGHT OF THE TOTAL MIXTURE AND (B) BEFORE THE CONVERSION OF MONOMER TO POLYMER EXCEEDS 75%, HYDROLYZING THE POLYMER TO POLYVINYL ALCOHOL OF SAPONIFICATION NUMBER NOT EXCEEDING 10, SPINNING AN AQUEOUS JSOLUTION OF THE POLYVINYL ALCOHOL JTO FORM A FILAMENT, ORIENTING SAID FILAMENT TO A DRY ORIENTED LENGTH AT LEAST THREE TIMES AS LONG AS THAT OF THE SPUN FILAMENT, AND DRYING, AND FURTHER ORIENTING THE DRY FILAMENT BY STRETCHING THE SAME AT A TEMPERATURE BETWEEN 200 AND 240* C. TO A FINAL LENGTH AT LEAST TWO AND ONE-HALF TIMES THE LENGTH AFTER THE FIRST ORIENTATION.
Claim 2
Dependent Claim
138 words
A PROCESS FOR THE PREPARATION OF IMPROVED POLYVINYL ALCOHOL FIBERS WHICH COMPRISES POLYMERIZING VINYL FORMATE IN A LIQUID DILUENT MISCIBLE WITH VINYL FORMATE MONOMER, INTERRUPTING THE POLYMERIZATION (A) BEFORE THE CONCENTRATION OF THE POLYMER IN THE POLYMERIZATION MIXTURE EXCEEDS 60% OF THE WEIGHT OF THE TOTAL MIXTURE AND (B) BEFORE THE CONVERSION OF MONOMER TO POLYMER EXCEEDS 75%, HYDROLYZING THE POLYMER TO POLYVINYL ALCOHOL OF SAPONIFICATION NUMBER NOT EXCEEDING 10, SPINNING AN AQUEOUS JSOLUTION OF THE POLYVINYL ALCOHOL JTO FORM A FILAMENT, ORIENTING SAID FILAMENT TO A DRY ORIENTED LENGTH AT LEAST THREE TIMES AS LONG AS THAT OF THE SPUN FILAMENT, AND DRYING, AND FURTHER ORIENTING THE DRY FILAMENT BY STRETCHING THE SAME AT A TEMPERATURE BETWEEN 200 AND 240* C. TO A FINAL LENGTH AT LEAST TWO AND ONE-HALF TIMES THE LENGTH AFTER THE FIRST ORIENTATION.
References Cited (Backward Citations)
GB322157A
Cited
US2236061A
Cited
US2233442A
Cited
US2322976A
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US2420565A
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US2447140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-16 | 1956-03-17 | 1956-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-16 | 1960-03-17 | 1960-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-16 | 1964-03-17 | 1964-09-16 | $7700.00 | Window Closed / Lapsed |