Patent US4898163A successfully refreshed from Google Patents.
US2548853A
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Treating acrylonitrile copolymers with sulfuric acid followed by dyeing with acetate dyes
Assignee: Akzo Nobel UK PLC
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Filing: 1948-10-01
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Granted: 1951-04-17
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Expires: 1968-10-01
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:15
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P1/00; D06P1/44; D06P1/673; D06P1/67316; D06P3/70; D06P3/72; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927; Y10S8/93
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE PROCESS OF DYEING AN ARTICLE COMPRISING AN ACRYLONITRILE COPOLYMER CONTAINING ABOUT 40% BY WEIGHT OF ACRYLONITRILE IN THE POLYMER MOLECULE WHICH COMPRISES TREATING SUCH ARTICLE WITH AN AQUEOUS SULFURIC ACID SOLUTION OF FROM 75 TO 85% CONCENTRATION FOR FROM 15 SECONDS TO 5 MINUTES AT ROOM TEMPERATURE, WASHING THE ARTICLE FREE OF ACID, COMPLETELY DRYING THE ARTICLE AND THEN DYEING THE ACID-TREATED ARTICLE IN A DYEBATH CONSISTING OF AN AQUEOUS DISPERSION OF A CELLULOSE ACETATE TYPE DYESTUFF.
Claim 2
Dependent Claim
78 words
THE PROCESS OF DYEING AN ARTICLE COMPRISING AN ACRYLONITRILE COPOLYMER CONTAINING ABOUT 40% BY WEIGHT OF ACRYLONITRILE IN THE POLYMER MOLECULE WHICH COMPRISES TREATING SUCH ARTICLE WITH AN AQUEOUS SULFURIC ACID SOLUTION OF FROM 75 TO 85% CONCENTRATION FOR FROM 15 SECONDS TO 5 MINUTES AT ROOM TEMPERATURE, WASHING THE ARTICLE FREE OF ACID, COMPLETELY DRYING THE ARTICLE AND THEN DYEING THE ACID-TREATED ARTICLE IN A DYEBATH CONSISTING OF AN AQUEOUS DISPERSION OF A CELLULOSE ACETATE TYPE DYESTUFF.
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) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |