Patent US2749333A successfully refreshed from Google Patents.
US2749333A
Expired / Lapsed
US
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Metal-containing polyazo dyestuffs
Assignee: Sandoz AG
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Filing: 1953-12-18
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Granted: 1956-06-05
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Expires: 1973-12-18
Abstract
No abstract record available.
Inventors
- 👤 Kappeler Markus
- 👤 Schweizer August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:22
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/24; D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/32; D06P3/3206; D06P3/3226; D06P3/3233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A POLYAZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA WHEREIN W STANDS FOR A MEMBER SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM AND A-N=N-MONONUCLEAR ARYL RADICAL, X STANDS FOR A BRIDGE SELECTED FROM THE GROUP CONSISTING OF -CH=CH- AND
Claim 2
Dependent Claim
40 words
A POLYAZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA WHEREIN W STANDS FOR A MEMBER SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM AND A-N=N-MONONUCLEAR ARYL RADICAL, X STANDS FOR A BRIDGE SELECTED FROM THE GROUP CONSISTING OF -CH=CH- AND
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) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |