US3063787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of wet spinning stereoregular polyvinyl alcohol
Assignee: Diamond Shamrock Corp
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Filing: 1960-06-17
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Granted: 1962-11-13
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Expires: 1980-06-17
Abstract
No abstract record available.
Inventors
- 👤 Henry J Rynkiewicz
- 👤 Eugene W K Schwarz
- 👤 Skeist Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:36
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14; Y; Y10; Y10S; Y10S8/00; Y10S8/10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
,1. THE METHOD OF PRODUCING STEREOREGULAR POLYVINYL ALCOHOL FIBERS WHICH ARE INSOLUBLE IN WATER AT 100*C. AND HAVE A TENACITY OF AT LEAST 6.8 GAMS DENIER WHICH COMPRISES THE STEPS OF FORMING A SOLUTION OF STEREOREGULAR POLYVINYL ALCOHOL IN ETHYLENE DIMINE CONTAINING ABOUT 3% TO 24% BY WEIGHT POLYVINYL ALCOHOL, EXTRUDING THE SOLUTION THROUGH A SPINNERETTE INTO A COAGULATING BATH OF LOWER ALIPHATIC ALCOHOL CONTAINING UP TO 4 CARBON ATOMS, WET-STRETCHING THE FIBER TO ABOUT 1 TO 3 TIMES ITS ORIGINAL LENGTH AND HOT-STREATCHING THE FIBER ABOUT 4 TO 12 TIMES ITS ORIGINAL LENGTH AT A TEMPERATURE OF ABOUT 120*-180*C.
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) | 1965-11-12 | 1966-05-14 | 1966-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-12 | 1970-05-14 | 1970-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-12 | 1974-05-14 | 1974-11-13 | $7700.00 | Window Closed / Lapsed |