Patent US4020056A successfully refreshed from Google Patents.
US4020056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Di-vinyl phthalides color formers
Assignee: WTA Inc
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Filing: 1975-04-10
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Granted: 1977-04-26
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Expires: 1995-04-10
Abstract
Abstract A chromogenic compound of normally colorless form is disclosed having the following structural formula: ##STR1## wherein A and B can be ##STR2## X, Y and Z can be, among several others, hydrogen, alkyl, alkoxy, aryl, and heterocyclic, substituted and unsubstituted; and E can be a broad family of aromatic and heterocyclic structures. The compound is eligible for use in pressure-sensitive record materials and manifold marking systems. Because of light absorption characteristics, selected compounds of this invention are especially useful where machine readability and machine copiability are important.
Inventors
- 👤 Sheldon Farber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:47
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/88; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/26; B41M5/30; B41M5/323; B41M5/327; C07D209/00; C07D209/02; C07D209/04; C07D209/30; C07D209/32; C07D209/36; C07D307/92; C07D313/00; C07D313/16; C07D313/20; C07D491/00; C07D491/02; C07D491/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A compound represented by the formula: ##STR10## wherein E is ##STR11## unsubstituted and alkyl-, chloro-, dichloro-, trichloro-, tetrachloro-, bromo-, dibromo-, tribromo-, tetrabromo-, nitro- and dialkylamino-substituted; ##STR12## unsubstituted and nitro-substituted; ##STR13## Y is: X or hydrogen; Z is: hydrogen or methyl; R 1 and R 2 are: hydrogen, alkyl, phenyl, and benzyl, and but R 1 and R 2 are not both phenyl; R 3 , r 4 , r 5 , and R 6 are: hydrogen, alkyl, phenyl, benzyl, alkoxy, halo, dialkylamino, monoalkylamino, amino, acetylamino; and wherein alkyl, each occurrence, and alkoxy have one to six carbon atoms.
Claim 2
Dependent Claim
98 words
A compound represented by the formula: ##STR10## wherein E is ##STR11## unsubstituted and alkyl-, chloro-, dichloro-, trichloro-, tetrachloro-, bromo-, dibromo-, tribromo-, tetrabromo-, nitro- and dialkylamino-substituted; ##STR12## unsubstituted and nitro-substituted; ##STR13## Y is: X or hydrogen; Z is: hydrogen or methyl; R 1 and R 2 are: hydrogen, alkyl, phenyl, and benzyl, and but R 1 and R 2 are not both phenyl; R 3 , r 4 , r 5 , and R 6 are: hydrogen, alkyl, phenyl, benzyl, alkoxy, halo, dialkylamino, monoalkylamino, amino, acetylamino; and wherein alkyl, each occurrence, and alkoxy have one to six carbon atoms.
Claim 3
Dependent Claim
12 words
The compound of claim 1 wherein A and B are the same.
Claim 4
Dependent Claim
9 words
The compound of claim 2. wherein Y is: ##STR14##
Claim 5
Dependent Claim
9 words
The compound of claim 2 wherein Y is hydrogen.
Claim 6
Dependent Claim
29 words
The compound of claim 3 wherein R 1 and R 2 are alkyl and R 3 , R 4 , R 5 , R 6 and Z are hydrogen.
Claim 7
Dependent Claim
29 words
The compound of claim 3 wherein R 1 , R 2 and R 3 are alkyl and R 4 , R 5 , R 6 and Z are hydrogen.
Claim 8
Dependent Claim
29 words
The compound of claim 4 wherein R 1 and R 2 are alkyl and R 3 , R 4 , R 5 , R 6 and Z are hydrogen.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |