Patent US3985772A successfully refreshed from Google Patents.
US3985772A
Expired / Lapsed
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3-Amidinocoumarin dyes
Assignee: BASF SE
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Filing: 1974-01-14
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Granted: 1976-10-12
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Expires: 1994-01-14
Abstract
Abstract Dyes of the formula:
Inventors
- 👤 Horst Scheuermann
- 👤 Dietmar Augart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:05
CPC Classifications
C; C09; C09B; C09B57/00; C09B57/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
A dye having the formula ##SPC18## in which R is benzyl, phenylethyl, phenyl or phenyl substituted by methyl, ethyl, methoxy, ethoxy, chlorine or bromine; R 1 is alkyl of 1 to 4 carbon atoms; R 2 is alkyl of 1 to 4 carbon atoms; and R 1 and R 2 together with the nitrogen are ##EQU1##
Claim 2
Dependent Claim
56 words
A dye having the formula ##SPC18## in which R is benzyl, phenylethyl, phenyl or phenyl substituted by methyl, ethyl, methoxy, ethoxy, chlorine or bromine; R 1 is alkyl of 1 to 4 carbon atoms; R 2 is alkyl of 1 to 4 carbon atoms; and R 1 and R 2 together with the nitrogen are ##EQU1##
Claim 3
Dependent Claim
19 words
A dye as claimed in claim 1 wherein each of R 1 and R 2 represents methyl or ethyl.
Claim 4
Dependent Claim
11 words
A dye as claimed in claim 2 wherein R is phenylethyl.
Claim 5
Dependent Claim
6 words
The dye having the formula ##SPC19##
Claim 6
Dependent Claim
6 words
The dye having the formula ##SPC19##
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |