Patent US2297870A successfully refreshed from Google Patents.
US2637620A
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Method of dyeing an acrylonitrile copolymer with acid dyes and thiourea
Assignee: Solutia Inc
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Filing: 1950-02-27
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Granted: 1953-05-05
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Expires: 1970-02-27
Abstract
No abstract record available.
Inventors
- 👤 George E Ham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:02
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/642; D06P1/649; D06P1/6491; D06P3/00; D06P3/70; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A METHOD OF DYEING A FIBER OF A COPOLYMER OF 75 TO 98 PERCENT BY WEIGHT OF ACRYLONITRILE AND FROM TWO TO 25 PERCENT OF A COMPOUND HAVIN THE FORMULA:
Claim 2
Independent Claim
30 words
A METHOD OF DYEING A FIBER OF A COPOLYMER OF 75 TO 98 PERCENT BY WEIGHT OF ACRYLONITRILE AND FROM TWO TO 25 PERCENT OF A COMPOUND HAVIN THE FORMULA:
References Cited (Backward Citations)
US2332899A
Cited
US2497526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |