Patent US2673198A successfully refreshed from Google Patents.
US2673198A
Expired / Lapsed
US
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Polyazo dyestuffs
Assignee: Sandoz AG
•
Filing: 1951-06-20
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Granted: 1954-03-23
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Expires: 1971-06-20
Abstract
No abstract record available.
Inventors
- 👤 Grandjean Philippe
- 👤 Wehrli Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:34
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/136; C09B43/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
THE POLYAZO DYESTUFF CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
7 words
THE POLYAZO DYESTUFF CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
US2104595A
Cited
US1940683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |