US2922728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of yellowing in freshly spun viscose rayon with tartaric, citric or gluconic acid
Assignee: Akzona Inc
•
Filing: 1956-11-05
•
Granted: 1960-01-26
•
Expires: 1976-11-05
Abstract
No abstract record available.
Inventors
- 👤 Jr Guy H White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:31
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/02; D01F2/00; D01F2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A METHOD OF AFTERTREATING FRESHLY SPUN VISCOSE RAYON YARN SUBSTANTIALLY FREE OF IMPURITIES CONSISTING OF THE STEPS OF IMPREGNATING SAID YARN WITH AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF A SMALL AMOUNT OF A NON-VOLATILE ALIPHATIC ORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF TARTARIC ACID, CITRIC ACID AND GLUCONIC ACID, SAID SOLUTION HAVING A PH PRODUCED BY SAID ACID OF LESS THAN ABOUT 4.2 AND INSUFFICIENT TO APPRECIABLY EFFECT THE PHYSICAL PROPERTIES OF THE YARN, AND THEREAFTER DRYING FOR THE FIRST TIME THE ACID IMPREGNATED YARN, THE RESULTING YARN BEING CHARACTERIZED BY THE ABSENCE OF YELLOW COLORATION.
Claim 2
Independent Claim
97 words
A METHOD OF AFTERTREATING FRESHLY SPUN VISCOSE RAYON YARN SUBSTANTIALLY FREE OF IMPURITIES CONSISTING OF THE STEPS OF IMPREGNATING SAID YARN WITH AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF A SMALL AMOUNT OF A NON-VOLATILE ALIPHATIC ORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF TARTARIC ACID, CITRIC ACID AND GLUCONIC ACID, SAID SOLUTION HAVING A PH PRODUCED BY SAID ACID OF LESS THAN ABOUT 4.2 AND INSUFFICIENT TO APPRECIABLY EFFECT THE PHYSICAL PROPERTIES OF THE YARN, AND THEREAFTER DRYING FOR THE FIRST TIME THE ACID IMPREGNATED YARN, THE RESULTING YARN BEING CHARACTERIZED BY THE ABSENCE OF YELLOW COLORATION.
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Cited
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Cited
US2821489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-25 | 1963-07-27 | 1964-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-25 | 1967-07-27 | 1968-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-25 | 1971-07-27 | 1972-01-26 | $7700.00 | Window Closed / Lapsed |