US2932550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid pretreatment of polyacrylonitrile-type fibers and the treated fibers
Assignee: Solutia Inc
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Filing: 1953-10-14
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Granted: 1960-04-12
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Expires: 1973-10-14
Abstract
No abstract record available.
Inventors
- 👤 Leslie L Walmsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:20
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/70; D06P3/74; D01; D01F; D01F6/00; D01F6/28; D01F6/38; D01F6/44; D01F6/54; D06P1/00; D06P1/44; D06P1/673; D06P1/67316; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927; Y10S8/93; Y10S8/931
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
THE PROCESS OF INCREASING THE AFFINITY FOR ACID AND DIRECT DYES OF POLYMERIC FIBERS CONTAINING AT LEAST 80 PERCENT BY WEIGHT OF ACRYLONITRILE IN POLYMERIC FORM AND FROM 2 TO 10 PERCENT OF AN N-HETEROCYCLIC MONOMER IN POLYMERIC FROM WHICH COMPRISES TREATING SUCH FIBERS WITH AN AQUEOUS SOLUTION CONTAINING AS THE SOLE ACTIVE INGREDIENT FROM 1.0 TO 10 PERCENT OF AN ACID HAVING A DISSOCIATION CONSTANT AT LEAST ABOUT 1.76X10**-4, AT ELEVATED TEMPERATURES AND FOR FROM ABOUT ONE SECOND TO ABOUT ONE MINUTE, AND THEN WASHING THE FIBERS FREE OF EXCESS ACID.
Claim 2
Dependent Claim
92 words
THE PROCESS OF INCREASING THE AFFINITY FOR ACID AND DIRECT DYES OF POLYMERIC FIBERS CONTAINING AT LEAST 80 PERCENT BY WEIGHT OF ACRYLONITRILE IN POLYMERIC FORM AND FROM 2 TO 10 PERCENT OF AN N-HETEROCYCLIC MONOMER IN POLYMERIC FROM WHICH COMPRISES TREATING SUCH FIBERS WITH AN AQUEOUS SOLUTION CONTAINING AS THE SOLE ACTIVE INGREDIENT FROM 1.0 TO 10 PERCENT OF AN ACID HAVING A DISSOCIATION CONSTANT AT LEAST ABOUT 1.76X10**-4, AT ELEVATED TEMPERATURES AND FOR FROM ABOUT ONE SECOND TO ABOUT ONE MINUTE, AND THEN WASHING THE FIBERS FREE OF EXCESS ACID.
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) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |