Patent US3741720A successfully refreshed from Google Patents.
US3741720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous dyeing of polyester fibers
Assignee: Bayer AG
•
Filing: 1970-10-12
•
Granted: 1973-06-26
•
Expires: 1990-10-12
Abstract
Abstract THE CONTINOUS DYEING OF SYBTHETIC FIBRE MATERIALS FROM ORGANIC SOLVENTS. THE FIBRE MATERIALS ARE IMPREGNATED WITH DYE LIQUORS WHICH CONTAIN ANTHRAQUINONE DYESTUFFS OF THE FORMULA 1-(R1-NH-),4-(R-CO-NH-)ANTHRAQUINONE IN WHICH R REPRESENTS A C1-C17-ALKYL RADICAL, AN ARALKYL OR OPTINALLY SUBSTITUTED ARYL RADICAL AND R1 STANDS FOR AN ALKYL RADICAL WHICH MAY BE SUBSTITUTED BY ALKOXY OR ALKYLAMINO GROUPS, FOR A CYCLOALKYL, ARALKYL OR FOR AN OPTIONALLY SUBSTITUTED ARYL RADICAL, AND SUBEQUENTLY SUBJUCTED TO A HEAT TREATMENT.
Inventors
- 👤 R Neeff
- 👤 V Hederich
- 👤 G Gehrke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:41
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/40; C09B1/42; D; D06; D06P; D06P1/00; D06P1/90; D06P1/908; Y; Y10; Y10S; Y10S8/00; Y10S8/938
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |