Patent US2784178A successfully refreshed from Google Patents.
US2784178A
Expired / Lapsed
US
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Azo-dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1954-05-03
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Granted: 1957-03-05
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Expires: 1974-05-03
Abstract
No abstract record available.
Inventors
- 👤 Zickendraht Christian
- 👤 Buehler Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:47
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A MEMBER OF THE GROUP CONSISTING OF AN ORTHO:ORTHO''-DIHYDROXY MONOAZO DYESTUFF WHICH CONTAINS AN AROMATICALLY BOND -SO2NH2- GROUP, IS FREE FROM SULFONIC ACID AND CARBOXYLIC ACID GROUP AND CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
32 words
A MEMBER OF THE GROUP CONSISTING OF AN ORTHO:ORTHO''-DIHYDROXY MONOAZO DYESTUFF WHICH CONTAINS AN AROMATICALLY BOND -SO2NH2- GROUP, IS FREE FROM SULFONIC ACID AND CARBOXYLIC ACID GROUP AND CORRESPONDS TO THE FORMULA
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) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |