US6030440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-based pigment-type ink and ink jet printer
Assignee: Fujitsu Isotec Ltd
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Filing: 1998-02-27
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Granted: 2000-02-29
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Expires: 2018-02-27
Abstract
Abstract A water-based pigment-type ink containing at least water, a pigment and a dispersant, the pigment particles having an average particle diameter of not larger than 0.1 μm, the weight ratio of the pigment to the dispersant being from 1.2 to 5. The water-based pigment-type ink exhibits more excellent color tone and chroma, by adding the fluorescent pigment in an amount of from 0.1% by weight to 3% by weight with respect to the amount of the ink. Furthermore, the water-based pigment-type ink comprises at least a pigment, a high-molecular dispersant, a surfactant and water, the pigment particles having an average particle diameter of not larger than 80 nm, a maximum particle diameter not being larger than 0.1 μm, the high-molecular dispersant being added in an amount of from 3% by weight to 20% by weight with respect to the amount of the ink, and the surfactant being added in an amount of from 2% by weight to 4% by weight with respect to the amount of the ink.
Inventors
- 👤 Chiaki Sekioka
- 👤 Masaru Sugie
- 👤 Kohei Kiyota
- 👤 Hiroyuki Ohyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:19
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50; C09B; C09B67/00; C09B67/0033; C09D11/30; C09D11/32; C09D11/322; C09D11/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
An ink-jet printer comprising a plurality of ink tanks, each tank containing a different colored ink, and a printer head having nozzles for ejecting inks of different colors, each of said ink tanks containing a water-based pigment ink which comprises water, pigment particles and a dispersant, the pigment particles having an average particle diameter of not larger than 0.1 μm, and the weight ratio of the dispersant to the pigment being from 1.2 to 5, and the diameter of the nozzles for ejecting one of the inks of one color being different than the diameter of the nozzles for ejecting an ink of a different color and being variable over a range of from 20 μm to 50 μm.
Claim 2
Dependent Claim
119 words
An ink-jet printer comprising a plurality of ink tanks, each tank containing a different colored ink, and a printer head having nozzles for ejecting inks of different colors, each of said ink tanks containing a water-based pigment ink which comprises water, pigment particles and a dispersant, the pigment particles having an average particle diameter of not larger than 0.1 μm, and the weight ratio of the dispersant to the pigment being from 1.2 to 5, and the diameter of the nozzles for ejecting one of the inks of one color being different than the diameter of the nozzles for ejecting an ink of a different color and being variable over a range of from 20 μm to 50 μm.
Claim 3
Dependent Claim
33 words
An ink-jet printer according to claim 1, wherein a fluorescent pigment is further added in an amount of 0.1% by weight to 3% by weight with respect to the amount of the ink.
Claim 4
Dependent Claim
57 words
An ink-jet printer according to claim 1, wherein the diameter of the nozzles is nearly the same for a yellow pigment and for a black pigment, is nearly the same for a magenta pigment and for a cyan pigment, and is different for a group of yellow and black, and for a group of magenta and cyan.
Claim 5
Dependent Claim
28 words
An ink-jet printer according to claim 1, wherein the diameter of the nozzles for ejecting ink depends on the color of the pigment in the ink being ejected.
Claim 6
Dependent Claim
100 words
An ink-jet printer comprising a plurality of ink tanks, each tank containing a different colored ink, and a printer head having nozzles for ejecting inks of different colors, each of said colored inks including a water-based pigment ink which comprises water, pigment particles and a dispersant, the pigment particles having an average particle diameter of not larger than 0.1 μm, and the weight ratio of the dispersant to the pigment being from 1.2 to 5, said ink-jet printer further comprising a means capable of changing the size of the ink droplets ejected from the nozzles in at least three steps.
Claim 7
Dependent Claim
100 words
An ink-jet printer comprising a plurality of ink tanks, each tank containing a different colored ink, and a printer head having nozzles for ejecting inks of different colors, each of said colored inks including a water-based pigment ink which comprises water, pigment particles and a dispersant, the pigment particles having an average particle diameter of not larger than 0.1 μm, and the weight ratio of the dispersant to the pigment being from 1.2 to 5, said ink-jet printer further comprising a means capable of changing the size of the ink droplets ejected from the nozzles in at least three steps.
Claim 8
Dependent Claim
50 words
An ink-jet printer according to claim 5, wherein means for changing the size of the ink droplets ejected from the nozzles includes means for changing at least the magnitude of pulse voltage applied for ejecting the ink droplets, the width of pulse voltage, or the rising time of pulse voltage.
Claim 9
Dependent Claim
37 words
An ink-jet printer according to claim 5, wherein said ink-jet printer further includes a piezoelectric actuator and the size of ink droplets ejected from said nozzles is changed by altering the voltage applied to said piezoelectric actuator.
References Cited (Backward Citations)
US3615749A
Cited
US3928226A
Cited
WO1995021897A1
Cited
US5690721A
Cited
JPH07292302A
Cited
DE19654752A1
Cited
US5736606A
Cited
US5803958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-02-28 | 2003-08-30 | 2004-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-28 | 2007-08-30 | 2008-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-28 | 2011-08-30 | 2012-02-29 | $7700.00 | Window Closed / Lapsed |