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Patent US3681390A successfully refreshed from Google Patents.
US3681390A
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US
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Dialkylamino fluoran chromogenic compounds
Assignee: Appvion LLC
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Filing: 1970-11-16
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Granted: 1972-08-01
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Expires: 1990-11-16
Abstract
Abstract A chromogenic material of normally colorless form is disclosed, having a structural formula: WHEREIN R5 represents an alkyl radical having less than five carbon atoms or hydrogen radicals. Z represents nitro-, amino-, dialkylamino-, alkyl radicals have less than five carbon atoms or hydrogen radicals, and Y comprises nitro-, amino-, carboxyl, hydrogen and ester radicals and the remaining other R1 and R2 comprises amino-, nitro-, hydrogen, alkyl having less than five carbon atoms, acetamido and halogen radicals: R comprises hydrogen radicals and alkyl radicals having less than five carbon atoms; and R3 comprises alkyl radicals having less than five carbon atoms; -said material assuming a colored form upon reactive contact with a Lewis acid molecule. Examples include 2''(2-carboxyanilino)-6''-diethylaminofluoran; 2''-anilino-6''diethylaminofluoran; 2''-(3-carbomethoxy-2-naphthylamino)-6''diethylaminofluoran; 2''-(2-carbomethoxyanilino)-6''-diethylamino3''-methylfluoran; 2''-(3-carboxy-2-naphthylamino)-6''-diethylamino3''-methylfluoran; 6-(2-carboxyanilino)-2''-chloro-6''-diethylamino3''-methylfluoran; 2''-(2-carboxy-4-nitroanilino)-6''diethylaminofluoran;6''-diethylamino-2''-(N -methylanilino) fluoran; and 6''-diethylamino-2''-(2,4-dinitroanilino)fluoran.
Inventors
- 👤 Chao-Han Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:23
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/1455; C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
28 words
The chromogenic compound of claim 1 wherein R and R2 are hydrogen radicals, R1 is a (2-carboxyanilino) radical and R3 is an ethyl radical, said compound being 2''-(2-carboxyanilino)-6''-diethylaminofluoran.
Claim 2
Dependent Claim
28 words
The chromogenic compound of claim 1 wherein R and R2 are hydrogen radicals, R1 is a (2-carboxy-4-nitroanilino) radical, and R3 is an ethyl radical, said compound being 2''-(2-carboxy-4-nitroanilino)-6''-diethylaminofluoran.
Claim 3
Dependent Claim
28 words
The chromogenic compound of claim 1 wherein R and R2 are hydrogen radicals, R1 is a (2-carbomethoxyanilino) radical, and R3 is an ethyl radical, said compound being 2''-(2-carbomethoxyanilino)-6''-diethylaminofluoran.
Claim 4
Dependent Claim
28 words
The chromogenic compound of claim 1 wherein R and R2 are hydrogen radicals, R1 is an anilino radical and R3 is an ethyl radical, said compound being 2''-anilino-6''-diethylaminofluoran.
Claim 5
Dependent Claim
28 words
The chromogenic compound of claim 1 wherein R and R2 are hydrogen radicals, R1 is an (N-methylanilino) radical and R3 is an ethyl radical, said compound being 6''-diethylamino-2''-(N-methylanilino)fluoran.
Claim 6
Dependent Claim
28 words
The chromogenic compound of claim 1 wherein R and R2 are hydrogen radicals, R1 is an (2,4-dinitroanilino) radical and R3 is an ethyl radical, said compound being 6''-diethylamino-2''-(2,4-dinitroanilino)fluoran.
Claim 7
Dependent Claim
28 words
The chromogenic compound of claim 1 wherein R and R2 are hydrogen radicals, R1 is a (3-carboxy-2-naphthylamino) radical, and R3 is an ethyl radical, said compound being 2''-(3-carboxy-2-naphthylamino)-6''-diethylaminofluoran.
Claim 8
Dependent Claim
28 words
The chromogenic compound of claim 1 wherein R and R2 are hydrogen radicals, R1 is a (3-carbomethoxy-2-naphthylamino) radical, and R3 is an ethyl radical, said compound being 2''-(3-carbomethoxy-2-naphthylamino)-6''-diethylaminofluoran.
Claim 9
Dependent Claim
32 words
The chromogenic compound of claim 1 wherein R is a methyl radical, R1 is a (2-carboxyanilino) radical, R2 is a hydrogen radical, and R3 is an ethyl radical, said compound being 2''-(2-carboxyanilino)-6''-diethylamino-3''-methylfluoran.
Claim 10
Dependent Claim
32 words
The chromogenic compound of claim 1 wherein R is a methyl radical, R1 is a (2-carbomethoxyanilino) radical, R2 is a hydrogen radical, and R3 is an ethyl radical, said compound being 2''-(2-carbomethoxyanilino)-6''-diethylamino-3''-methylfluoran.
Claim 11
Dependent Claim
32 words
The chromogenic compound of claim 1 wherein R is a methyl radical, R1 is an anilino radical, R2 is a hydrogen radical, and R3 is an ethyl radical, said compound being 2''-anilino-6''-diethylamino-3''-methylfluoran.
Claim 12
Dependent Claim
27 words
The chromogenic compound of claim 1 wherein R is a (3-carboxy-2-naphthylamino) radical, R2 is a hydrogen radical, and R3 is an ethyl radical, said compound being 2''-(3-carboxy-2-naphthylamino)-6''-diethylamino-3''-methylfluoran.
Claim 13
Dependent Claim
32 words
The chromogenic compound of claim 1 wherein R is a methyl radical, R1 is a (3-carbomethoxy-2-naphthylamino) radical, R2 is a hydrogen radical, and R3 is an ethyl radical, said compound being 2''-(3-carbomethoxy-2-naphthylamino)-6''-diethylamino-3''-methylfluoran.
Claim 14
Dependent Claim
41 words
The chromogenic compound of claim 1 wherein R is a methyl radical, R1 is a chloro radical, R2 is a (2-carboxyanilino) radical, and R3 is an ethyl radical, said compound being one selected from the group consisting of 5-(2-carboxyanilino)-2''-chloro-6''-diethylamino-3''-methylfluoran and 6-(2-carboxyanilino)-2''-chloro-6''-diethylamino-3''-methylfluoran.
Claim 15
Dependent Claim
14 words
The chromogenic compound of claim 1 wherein said compound is: 2''-anilino-6''-diethylaminofluoran; 2''-(2-carboxyanilino)-6''-diethylaminofluoran; or 2''-anilino-6''-diethylamino-3''-methylfluoran.
Claim 16
Dependent Claim
14 words
The chromogenic compound of claim 1 wherein said compound is: 3''-diethylamino-7''-(p-toluidino)fluoran; 3''-diethylamino-7''-(N-methylanilino)fluoran; or 3''-diethylamino-6''-methyl-7''-(p-toluidino)fluoran.
Claim 17
Dependent Claim
15 words
The chromogenic compound of claim 1 wherein said compound is: 2''-anilino-6''-diethylamino-6-nitrofluoran; 2''-anilino-6''-diethylamino-5-nitrofluoran; 2''-anilino-6''-diethylamino-6-aminofluoran; or 2''-anilino-6''-diethylamino-5-aminofluoran.
Claim 18
Dependent Claim
15 words
The chromogenic compound of claim 1 wherein said compound is: 3''-diethylamino-7''-(N-methylanilino)-6-nitrofluoran; 3''-diethylamino-7''-(N-methylanilino)-5-nitrofluoran; 3''-diethylamino-7''-(N-methylanilino)-6-aminofluoran; or 3''-diethylamino-7''-(N-methylamino)-5-aminofluoran.
Claim 19
Dependent Claim
13 words
The chromogenic compound of claim 1 wherein said compound is: 2''-anilino-6''-diethylamino-3''-methyl-6-nitrofluoran; or 2''-anilino-6''-diethylamino-3''-methyl-6-aminofluoran.
References Cited (Backward Citations)
US3501331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |