US2815338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basic azo dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1955-05-06
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Granted: 1957-12-03
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Expires: 1975-05-06
Abstract
No abstract record available.
Inventors
- 👤 Ruegg Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:42
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A DYESTUFF WHICH IS FREE FROM SULFONIC ACID AND CARBOXYLIC ACID GROUPS AND IN ITS FREE BASE STATE CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
22 words
A DYESTUFF WHICH IS FREE FROM SULFONIC ACID AND CARBOXYLIC ACID GROUPS AND IN ITS FREE BASE STATE CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
US2464785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |