US3376303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzothioxanthene dyestuffs and process for preparing them
Assignee: Hoechst AG
•
Filing: 1966-02-08
•
Granted: 1968-04-02
•
Expires: 1986-02-08
Abstract
No abstract record available.
Inventors
- 👤 Fuchs Otto
- 👤 Troster Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:33
CPC Classifications
C; C07; C07D; C07D495/00; C07D495/12; C07D495/16; C09; C09B; C09B57/00; C09B57/14; C09K; C09K11/00; C09K11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
DYESTUFFS CONSISTING OF A MIXTURE OF ISOMERIC COMPOUNDS OF THE FORMULAE
Claim 2
Dependent Claim
11 words
DYESTUFFS CONSISTING OF A MIXTURE OF ISOMERIC COMPOUNDS OF THE FORMULAE
References Cited (Backward Citations)
US2949467A
Cited
US3306904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |