US2777840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asymmetrical urea derivatives of monoazo-dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1952-04-29
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Granted: 1957-01-15
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Expires: 1972-04-29
Abstract
No abstract record available.
Inventors
- 👤 Liechti Hans Wilhelm
- 👤 Gunst Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:58
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/136; C09B43/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A DISAZO-DYESTUFF WHICH CONTAINS A SINGLE SULFONIC ACID GROUP CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
13 words
A DISAZO-DYESTUFF WHICH CONTAINS A SINGLE SULFONIC ACID GROUP 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) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |