Patent US2972508A successfully refreshed from Google Patents.
US2972508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyeing of polymers of acrylonitrile
Assignee: Bayer AG
•
Filing: 1956-12-13
•
Granted: 1961-02-21
•
Expires: 1976-12-13
Abstract
No abstract record available.
Inventors
- 👤 Kruckenberg Winfried
- 👤 Singer Josef
- 👤 Kleiner Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:46
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/06; C09B29/08; C09B29/0025; 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
22 words
A POLYACRYLONITRILE ARTICLE CONTAINING AT LEAST 85% BY WEIGHT OF ACRYLONITRILE, SAID ARTICLE BEING DYED WITH A MONOAZO DYESTUFF OF THE FORMULA
Claim 2
Dependent Claim
22 words
A POLYACRYLONITRILE ARTICLE CONTAINING AT LEAST 85% BY WEIGHT OF ACRYLONITRILE, SAID ARTICLE BEING DYED WITH A MONOAZO DYESTUFF OF THE FORMULA
References Cited (Backward Citations)
US2238485A
Cited
US2821526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-21 | 1964-08-22 | 1965-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-21 | 1968-08-22 | 1969-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-21 | 1972-08-22 | 1973-02-21 | $7700.00 | Window Closed / Lapsed |