US3022316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3, 6 bis-para-substituted-phenyl-amino-9-(2'sulfo-phenyl) xanthene
Assignee: Hoechst AG
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Filing: 1952-12-30
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Granted: 1962-02-20
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Expires: 1972-12-30
Abstract
No abstract record available.
Inventors
- 👤 Bestian Herbert
- 👤 Schafer Gustav
- 👤 Quint Ferdinand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:54
CPC Classifications
C; C09; C09B; C09B43/00; C09B11/00; C09B11/04; C09B11/10; C09B11/24; C09B11/28
Claims Analysis
Total Claims: 0
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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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |