Patent US4396429A successfully refreshed from Google Patents.
US4396429A
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Recording liquid
Assignee: Canon Inc
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Filing: 1982-06-17
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Granted: 1983-08-02
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Expires: 2002-06-17
Abstract
Abstract A recording liquid comprising an aqueous liquid composition containing a water-soluble dye as recording agent is characterized in that the content of m-phenylenediamine in said composition is 1000 ppm or less.
Inventors
- 👤 Tokio Matsumoto
- 👤 Seiichi Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:39
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
A heat-stable recording liquid comprising an aqueous liquid composition containing a sufficient amount of a water-soluble dye, synthesized from m-phenylenediamine, as recording agent to provide a desired image, characterized in that the content of m-phenylenediamine in said composition is 1000 ppm or less.
Claim 2
Dependent Claim
43 words
A heat-stable recording liquid comprising an aqueous liquid composition containing a sufficient amount of a water-soluble dye, synthesized from m-phenylenediamine, as recording agent to provide a desired image, characterized in that the content of m-phenylenediamine in said composition is 1000 ppm or less.
Claim 3
Dependent Claim
17 words
A recording liquid according to claim 1, wherein the content of m-phenylenediamine is 300 ppm or less.
Claim 4
Dependent Claim
17 words
A recording liquid according to claim 1, wherein the content of m-phenylenediamine is 100 ppm or less.
Claim 5
Dependent Claim
38 words
A recording liquid according to claim 1, wherein said water-soluble dye is at least one selected from the group consisting of C.I. Direct Black 19, C.I. Direct Black 22, C.I. Direct Black 38, and C.I. Direct Black 154.
Claim 6
Dependent Claim
20 words
A recording liquid according to claim 1, wherein said water-soluble dye is an amount of 1 to 10% by weight.
References Cited (Backward Citations)
DE2308678A1
Cited
DE3011235A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |