Patent US2646338A successfully refreshed from Google Patents.
US2646338A
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Disazo dyestuffs
Assignee: Sandoz AG
•
Filing: 1951-10-03
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Granted: 1953-07-21
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Expires: 1971-10-03
Abstract
No abstract record available.
Inventors
- 👤 Kappeler Markus
- 👤 Steinemann Willy
- 👤 Wehrli Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:41
CPC Classifications
C; C09; C09B; C09B33/00; C09B33/02; C09B33/12; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
15 words
A SUBSTANTIVE YELLOW DISAZO DYESTUFF WHICH IS A MIXTURE COMPRISING THE DYESTUFFS OF THE FORMULAE
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) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |