Patent US2792397A successfully refreshed from Google Patents.
US2792397A
Expired / Lapsed
US
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Quinazoline-amino-anthraquinone dyestuffs
Assignee: BASF SE
•
Filing: 1955-05-25
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Granted: 1957-05-14
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Expires: 1975-05-25
Abstract
No abstract record available.
Inventors
- 👤 Ebel Friedrich
- 👤 Randebrock Rudolf
- 👤 Rupp Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:04
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/46; C09B1/467
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
A PROCESS FOR THE PRODUCTION OF VAT DYESTUFF WHICH COMPRISES HEATING TO ABOUT 70* TO 250*C. A QUINAZOLINE DERIVATIVE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
23 words
A PROCESS FOR THE PRODUCTION OF VAT DYESTUFF WHICH COMPRISES HEATING TO ABOUT 70* TO 250*C. A QUINAZOLINE DERIVATIVE OF THE GENERAL FORMULA
Claim 3
Dependent Claim
6 words
VAT DYESTUFFS OF THE GENERAL FORMULA
Claim 4
Dependent Claim
6 words
VAT DYESTUFFS OF THE GENERAL FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-13 | 1960-11-12 | 1961-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-13 | 1964-11-12 | 1965-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-13 | 1968-11-12 | 1969-05-14 | $7700.00 | Window Closed / Lapsed |