US4533920A
Expired / Lapsed
US
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Ink-jet recording method
Assignee: Canon Inc
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Filing: 1984-05-29
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Granted: 1985-08-06
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Expires: 2004-05-29
Abstract
Abstract A method for ink jet recording comprises using inks of one or more colors and a plurality of inks different in dye concentration being used for each color. The pH of the inks for each color satisfies the following relation, 0.85≦pH min/pH max where pH min is the minimum value of pH of the inks for each color and pH max is the maximum value of pH of the inks for said color.
Inventors
- 👤 Eiichi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:08
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
A method for ink jet recording which comprises using inks of one or more colors and a plurality of inks different in dye concentration being used for each color, characterized in that the pH of the inks for each color satisfies the following relation, 0.85≦pH min/pH max where pH min is the minimum value of pH of the inks for each color and pH max is the maximum value of pH of the inks for said color.
Claim 2
Independent Claim
77 words
A method for ink jet recording which comprises using inks of one or more colors and a plurality of inks different in dye concentration being used for each color, characterized in that the pH of the inks for each color satisfies the following relation, 0.85≦pH min/pH max where pH min is the minimum value of pH of the inks for each color and pH max is the maximum value of pH of the inks for said color.
Claim 3
Dependent Claim
18 words
A method for ink jet recording according to claim 1 in which the relation is 0.90≦pH min/pH max.
Claim 4
Dependent Claim
24 words
A method for ink jet recording according to claim 1 in which the pH of each of the inks ranges from 8 to 11.
Claim 5
Dependent Claim
24 words
A method for ink jet recording according to claim 1 in which the pH of each of the inks ranges from 8 to 10.
Claim 6
Dependent Claim
40 words
A method for ink jet recording according to claim 1 in which the ink is an aqueous ink comprising a dye and a solvent selected from the group consisting of water and a mixture of water and a water-soluble solvent.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |