US3752825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenyl heteryl methane dyestuffs
Assignee: Bayer AG
•
Filing: 1970-09-25
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Granted: 1973-08-14
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Expires: 1990-09-25
Abstract
Abstract THIS INVENTION RELATES TO PHENYL-HETERYL-METHANE DYESTUFFS HAVING AN INDOLE NUCLEUS, AND THE PREPARATION THEREOF.
Inventors
- 👤 R Raue
- 👤 H Kuhlthau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:32
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/26; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/922; Y10S8/927
Claims Analysis
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |