USRE27800E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chj-chi
Assignee: —
•
Filing: 1972-01-14
•
Granted: 1973-10-30
•
Expires: 1992-01-14
Abstract
Abstract DYESTUFFS, WHICH IN HEIR FREE ACID FORM ARE OF THE FORMULA: 1-(CNH(2N+1)-CH(-CH3)-NH-),4-((CH3,HO3S-PHENYL)-NH-)- ANTHRAQUINONE WHEREIN N REPRESENTS 1 OR 2, ARE PARTICULARLY USEFUL FOR THE DYEING AND PRINTING OF SYNTHETIC OR NATURAL POLYAMIDE FIBERS.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:15
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32; C09B1/34; C09B1/346; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/917; Y10S8/92; Y10S8/924
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |