US4391639A
Expired / Lapsed
US
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Recording liquid
Assignee: Canon Inc
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Filing: 1982-09-02
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Granted: 1983-07-05
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Expires: 2002-09-02
Abstract
Abstract A recording liquid is characterized by containing as a dye a compound represented by the formula ##STR1## wherein R 1 represents hydrogen or C 1 -C 2 alkyl, R 2 and R 3 each represent hydrogen, C 1 -C 2 alkyl, or C 1 -C 2 alkoxy, R 4 and R 5 represent hydrogen or sulfo in salt form with base, and Q 1 represents naphthyl substituted by hydroxyl and by sulfo in salt form with base.
Inventors
- 👤 Masatsune Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:13
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/17; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/08; C09B35/20; C09B43/00; C09B43/18; C09B43/24; C09D11/30; C09D11/32; C09D11/328
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A recording liquid characterized by containing as a dye a compound represented by the formula ##STR7## wherein R 1 represents hydrogen or C 1 -C 2 alkyl, R 2 and R 3 each represent hydrogen, C 1 -C 2 alkyl, or C 1 -C 2 alkoxy, R 4 and R 5 represent hydrogen or sulfo in salt form with base, and Q 1 represents naphthyl substituted by hydroxyl and by sulfo in salt form with base in water or a mixture of water and a water-soluble organic solvent.
Claim 2
Dependent Claim
88 words
A recording liquid characterized by containing as a dye a compound represented by the formula ##STR7## wherein R 1 represents hydrogen or C 1 -C 2 alkyl, R 2 and R 3 each represent hydrogen, C 1 -C 2 alkyl, or C 1 -C 2 alkoxy, R 4 and R 5 represent hydrogen or sulfo in salt form with base, and Q 1 represents naphthyl substituted by hydroxyl and by sulfo in salt form with base in water or a mixture of water and a water-soluble organic solvent.
Claim 3
Dependent Claim
26 words
A recording liquid of claim 1, wherein said compound is contained in an amount within the range of 0.5-20% by weight based on the recording liquid.
Claim 4
Dependent Claim
15 words
A recording liquid of claim 1, wherein said water-soluble organic solvent is a polyhydric alcohol.
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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |