US3655672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quinophthalone dyestuffs and process for preparing them
Assignee: Hoechst AG
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Filing: 1969-05-19
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Granted: 1972-04-11
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Expires: 1989-05-19
Abstract
Abstract 3-HYDROXY-QUINOPHTHALONE DYESTUFFS SUBSTITUTED IN THE 4-POSITION BY AN ETHER OR THIOETHER GROUP, AND A PROCESS FOR PREPARING THEM. SAID DYESTUFFS YIELD ON SYNTHETIC FIBROUS MATERIALS, ESPICIALLY THOSE FROM POLYEHYLENE TEREPHTHALATES, YELLOW DYEINGS HAVING GOOD FASTNESS TO LIGHT, WET PROCESSING AND SOLVENTS AND A REMARKABLY GOOD FASTNESS TO THERMOFIXATION AND IRONING.
Inventors
- 👤 Ernst Spietschka
- 👤 Friedrich Ische
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:14
CPC Classifications
C; C09; C09B; C09B25/00; Y; Y10; Y10S; Y10S8/00; Y10S8/933
Claims Analysis
Total Claims: 0
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |