US2984539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dyeing polyacrylonitrile material
Assignee: BASF Schweiz AG
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Filing: 1959-01-20
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Granted: 1961-05-16
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Expires: 1979-01-20
Abstract
No abstract record available.
Inventors
- 👤 Matter Erich
- 👤 Albrecht Otto
- 👤 Hiestand Armin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:03
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/70; D06P3/76; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
IN THE METHOD FOR DYEING MATERIALS OF POLYACRYLONITRILE AND COPOLYMERS OF ACRYLONITRILE WITH BASIC DYESTUFFS THE IMPROVEMENT WHICH COMPRISES ADDING TO THE DYE-BATH AS RETARDER THE NEW DI-QUATERNARY AMMONIUM COMPOUND OF THE GENERAL FORMULA
Claim 2
Dependent Claim
34 words
IN THE METHOD FOR DYEING MATERIALS OF POLYACRYLONITRILE AND COPOLYMERS OF ACRYLONITRILE WITH BASIC DYESTUFFS THE IMPROVEMENT WHICH COMPRISES ADDING TO THE DYE-BATH AS RETARDER THE NEW DI-QUATERNARY AMMONIUM COMPOUND OF THE GENERAL FORMULA
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) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |