US3928685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-Hydroxy-1-(4-aminophenyl polymethine) naphthalan compounds and pressure-sensitive recording system therewith
Assignee: Moore Business Forms Inc
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Filing: 1974-11-21
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Granted: 1975-12-23
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Expires: 1994-11-21
Abstract
Abstract Disclosed are normally substantially colorless chromogenic 1hydroxy-1-(4-aminophenyl polymethine) naphthalan color precursor compounds having the following structural formula: WHEREIN EACH R represents either a hydrogen atom or a lower alkyl group having from one to five carbon atoms and wherein n is an integer from 1 to 3. These compounds are initially substantially colorless and are capable of becoming highly colored when brought into reactive contact with many conventional Lewis acid materials and the like. Accordingly these compounds are highly useful as a component of pressure-sensitive copying papers.
Inventors
- 👤 Derek J Alsop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:09
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/14; C09B23/145; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; C07; C07C; C07C51/00; C07C51/16; C07C51/295; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/92; C09B23/10; Y; Y10; Y10T; Y10T428/00; Y10T428/25
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
10 words
A 1-HYDROXY-1-(4-AMINOPHENYL POLYMETHINE) NAPHTHALAN COMPOUND HAVING THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
10 words
A 1-HYDROXY-1-(4-AMINOPHENYL POLYMETHINE) NAPHTHALAN COMPOUND HAVING THE FOLLOWING STRUCTURAL FORMULA:
Claim 3
Dependent Claim
13 words
A compound as set forth in claim 1 having the following structural formula:
Claim 4
Dependent Claim
36 words
A method for preparing a naphthalan compound as set forth in claim 1 comprising reacting one molar equivalent of a p-aminobenzaldehyde compound with one molar equivalent of a hydroxy naphthalan compound having the following structural formula:
Claim 5
Dependent Claim
37 words
A method for preparing a naphthalan compound as set forth in claim 1 comprising reacting one molar equivalent of a 3-(p-aminophenyl) propenal compound with one molar equivalent of a hydroxy naphthalan compound having the following structural formula:
Claim 6
Dependent Claim
37 words
A method for preparing a naphthalan compound as set forth in claim 1 comprising reacting one molar equivalent of a 5-(p-aminophenyl) pentadienal compound with one molar equivalent of a hydroxy naphthalan compound having the following structural formula:
Claim 7
Dependent Claim
14 words
A method as set forth in claim 3 wherein said p-aminobenzaldehyde compound is p-dimethylaminobenzaldehyde.
Claim 8
Dependent Claim
42 words
IN A PRESSURE-SENSITIVE REDORDING SYSTEM COMPRISING A LAYER OF MICROCAPSULES CONTAINING A SUBSTANTIALLY COLORLESS COLOR PRECURSOR COMPOUND ANDAL LAYER OF AN ELECTRON-ACCEPTOR MATERIAL, THE IMPROVEMENT WHICH COMPRISES UTILIZING, AS SAID COLOR PRECURSOR COMPOUND, A NAPHTHALAN COMPOUND AS SET FORTH IN CLAIM 1.
Claim 9
Dependent Claim
43 words
In a pressure-sensitive recording system comprising a layer of microcapsules containing a substantially colorless color precursor compound and a layer of an electon-acceptor material, the improvement which comprises utilizing, as said color precursor compound, a naphthalan compound as set forth in claim 2.
Claim 10
Dependent Claim
41 words
In a pressure-sensitive recording system comprising a layer containing a substantially colorless color precursor compound and a layer of an electron-acceptor material, the improvement Which comprises utilizing, as said color precursor compound, a naphthalan compound as set forth in claim 1.
Claim 11
Dependent Claim
41 words
In a pressure-sensitive recording system comprising a layer containing a substantially colorless color precursor compound and a layer of an electron-acceptor material, the improvement which comprises utilizing, as said color precursor compound, a naphthalan compound as set forth in claim 2.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |