US3211757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Symmetrical 4-halogeno-4', 4"-diarylamino-triphenylmethane dyestuffs
Assignee: Hoechst AG
•
Filing: 1962-05-01
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Granted: 1965-10-12
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Expires: 1982-05-01
Abstract
No abstract record available.
Inventors
- 👤 Schafer Gustav
- 👤 Quint Ferdinand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:52
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/12; C09B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A SYMMETRICAL DYESTUFF HAVING THE FORMULA
Claim 2
Dependent Claim
6 words
A SYMMETRICAL DYESTUFF HAVING THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |