US3776994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing polyvinyl alcohol fiber of improved property
Assignee: Kuraray Co Ltd
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Filing: 1971-11-26
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Granted: 1973-12-04
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Expires: 1991-11-26
Abstract
Abstract THE PROPERTIES OF POLYVINYL ALCOHOL FIBERS ARE IMPROVED BY SPINNING POLYVINYL ALCOHOL CONTAINING BORIC ACID OR A BORATE INTO AN ALKALINE SPINNING BATH CONTAINING A CONVENTIONAL DEHYDRATING SALT AND AN ADDITIVE COMPRISING 4X10**-5 TO 9X10**-2 MOL/L. OF (A) AN AMINOPOLYCARBOXYLIC ACID, OR (B) A CONDENSED PHOSPHORIC ACID, OR (C) A SALT, E.G., SODIUM OR POTASSIUM OR AMMONIUM SALTS OF (A) OR (B).
Inventors
- 👤 A Mizobe
- 👤 Y Yoshioka
- 👤 S Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:26
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14; D01F1/00; D01F1/02; D01F1/10
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |