US3808256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styryl dyes
Assignee: BASF SE
•
Filing: 1971-08-18
•
Granted: 1974-04-30
•
Expires: 1991-08-18
Abstract
Abstract P-AMINOSTYRYL DYES BEARING A BENZYL OR PHENYLETHYL GROUP AND A URETHANE GROUP AS SUBSTITUENTS ON THE AMONO NITROGEN ATOM. THE DYES ARE EMINENTLY SUITABLE FOR DYEING CELLULOSE ESTERS AND POLYESTERS.
Inventors
- 👤 H Scheuermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:08
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/14; C09B23/143; C08; C08K; C08K5/00; C08K5/16; C08K5/21
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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |