US4655835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for evaluating the solubility of a colorant
Assignee: Canon Inc
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Filing: 1985-08-08
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Granted: 1987-04-07
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Expires: 2005-08-08
Abstract
Abstract In a recording liquid comprising, as essential components, a colorant in an amount necessary to image formation, water, and a water-miscible organic solvent, said recording liquid is characterized in that the total number of colonies in the Ames test thereof is not more than four times that of the control test using sterilized water.
Inventors
- 👤 Masahiro Haruta
- 👤 Masatsune Kobayashi
- 👤 Tokuya Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:35
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/16
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
92 words
Process for evaluating the solubility of a colorant in a recording liquid and the solution stability of the recording liquid having a predetermined composition, including a colorant in amounts necessary to image formation, water and a water-miscible organic solvent comprising: (a) conducting an Ames test on said recording liquid; (b) comparing the test results with a control liquid using sterilized water; and (c) determining the total number of colonies in said Ames test thereof which, to pass said evaluation, should not exceed four times that of the control liquid using sterilized water.
Claim 2
Dependent Claim
92 words
Process for evaluating the solubility of a colorant in a recording liquid and the solution stability of the recording liquid having a predetermined composition, including a colorant in amounts necessary to image formation, water and a water-miscible organic solvent comprising: (a) conducting an Ames test on said recording liquid; (b) comparing the test results with a control liquid using sterilized water; and (c) determining the total number of colonies in said Ames test thereof which, to pass said evaluation, should not exceed four times that of the control liquid using sterilized water.
Claim 3
Dependent Claim
39 words
The evaluation process of claim 1, including providing a recording liquid wherein the Ames test conducted on said recording liquid yields a total number of colonies not more than three times that of the control test using sterilized water.
Claim 4
Dependent Claim
20 words
The evaluation process of claim 1, said process employing a colorant, present in amounts between 1 and 20% by weight.
Claim 5
Dependent Claim
22 words
The evaluation process of claim 1, said process employing a water-miscible organic solvent, present in amounts between 5 and 95% by weight.
Claim 6
Dependent Claim
19 words
The evaluation process of claim 1, said process employing water present in amounts between 5 and 95% by weight.
Claim 7
Dependent Claim
89 words
A process for preparing a recording liquid comprising: a colorant and a liquid medium, said liquid medium containing water and a water-miscible organic solvent, said process comprising the steps of (i) purifying said colorant; (ii) dissolving said purified colorant into said liquid medium to form a recording liquid (iii) conducting an Ames test on said recording liquid and (iv) selecting the recording liquid, providing that the total number of colonies in the Ames test thereof is not more than four times that of a control test using sterilized water.
Claim 8
Dependent Claim
89 words
A process for preparing a recording liquid comprising: a colorant and a liquid medium, said liquid medium containing water and a water-miscible organic solvent, said process comprising the steps of (i) purifying said colorant; (ii) dissolving said purified colorant into said liquid medium to form a recording liquid (iii) conducting an Ames test on said recording liquid and (iv) selecting the recording liquid, providing that the total number of colonies in the Ames test thereof is not more than four times that of a control test using sterilized water.
Claim 9
Dependent Claim
21 words
The process for preparing a recording liquid of claim 6, including conducting said Ames test using a Salmonella TA98 bacterial strain.
Claim 10
Dependent Claim
37 words
The process for preparing a recording liquid of claim 7, including selecting the recording liquid such that the total number of colonies in the Ames test thereof is not more than three times that of said control.
Claim 11
Dependent Claim
21 words
The process for preparing a recording liquid of claim 7, including employing distilled water for use in the Ames test control.
Claim 12
Dependent Claim
36 words
The process for preparing a recording liquid according to claim 7, including dissolving said colorant in said liquid medium at a concentration between 1 to 20% by weight, based upon the weight of the recording liquid.
Claim 13
Dependent Claim
27 words
The process for preparing a recording liquid according to claim 7, including employing as said water-miscible organic solvent, a polyhydric alcohol or a lower alkyl ether thereof.
Claim 14
Dependent Claim
38 words
The process for preparing a recording liquid according to claim 7, including employing said water-miscible organic solvent in said liquid medium at a concentration between 5 to 95% by weight, based upon the weight of the recording liquid.
Claim 15
Dependent Claim
36 words
The process for preparing a recording liquid according to claim 7, including utilizing said water in said liquid medium at a concentration between 10 to 90% by weight, based upon the weight of the recording liquid.
Claim 16
Dependent Claim
28 words
The process for preparing a recording liquid according to claim 7, including utilizing as said water-miscible organic solvent in said liquid medium at least one nitrogen-containing heterocyclic ketone.
References Cited (Backward Citations)
US3846141A
Cited
US4153467A
Cited
US4024096A
Cited
US4165399A
Cited
US4272538A
Cited
US4170482A
Cited
US4285727A
Cited
US4269627A
Cited
US4353988A
Cited
US4377697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |