Patent US2580987A successfully refreshed from Google Patents.
US2532437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyeing acrylonitrile polymers by applying an insoluble azo dyestuff and then heating
Assignee: Akzo Nobel UK PLC
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Filing: 1949-03-15
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Granted: 1950-12-05
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Expires: 1969-03-15
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:34
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/70; D06P3/72; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A METHOD OF DYEIG SHAPED ARTICLES COMPRISING OF ACRYLONITRILE POLYMER WHICH COMPRISES TREATING THE ARTICLE WITH AN AQUEOUS DYEBATH CONTAINING A WATER-INSOLUBLE AZO DYESTUFF SELECTED FROM THE GROUP CONSISITNG OF
Claim 2
Independent Claim
30 words
A METHOD OF DYEIG SHAPED ARTICLES COMPRISING OF ACRYLONITRILE POLYMER WHICH COMPRISES TREATING THE ARTICLE WITH AN AQUEOUS DYEBATH CONTAINING A WATER-INSOLUBLE AZO DYESTUFF SELECTED FROM THE GROUP CONSISITNG OF
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) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |