US5922115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decolorizable ink and printer
Assignee: Toshiba Corp
•
Filing: 1997-07-25
•
Granted: 1999-07-13
•
Expires: 2017-07-25
Abstract
Abstract Decolorizable ink consisting of an ink composition dispersed in a solvent, the ink composition comprising a color former, a developer and a decolorizer, wherein the color former and developer are in a colored state by interaction between them and the decolorizer has a property to dissolve preferentially the developer when the ink composition is melted.
Inventors
- 👤 Kenji Sano
- 👤 Katsuyuki Naito
- 👤 Satoshi Takayama
- 👤 Sawako Fujioka
- 👤 Tetsuo Okuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:41
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
Decolorizable ink consisting of an ink composition dispersed in a solvent, said ink composition comprising a color former, a developer and a decolorizer, wherein said color former and developer are in a colored state by interaction between them and said decolorizer has a property to dissolve preferentially one of said color former and developer when the ink composition is melted, and wherein said decolorizer is selected from the group consisting of cholic acid. lithocholic acid, testosterone, cortisone and their derivatives.
Claim 2
Dependent Claim
80 words
Decolorizable ink consisting of an ink composition dispersed in a solvent, said ink composition comprising a color former, a developer and a decolorizer, wherein said color former and developer are in a colored state by interaction between them and said decolorizer has a property to dissolve preferentially one of said color former and developer when the ink composition is melted, and wherein said decolorizer is selected from the group consisting of cholic acid. lithocholic acid, testosterone, cortisone and their derivatives.
Claim 3
Dependent Claim
32 words
The decolorizable ink according to claim 1, wherein said developer is contained in an amount of 0.1 to 10 parts by weight relative to one part by weight of said color former.
Claim 4
Dependent Claim
32 words
The decolorizable ink according to claim 1, wherein said decolorizer is contained in an amount of 1 to 200 parts by weight relative to one part by weight of said color former.
Claim 5
Dependent Claim
12 words
The decolorizable ink according to claim 1, wherein said solvent is water.
Claim 6
Dependent Claim
21 words
The decolorizable ink according to claim 1, wherein the ink composition is dispersed in the solvent in the form of microcapsules.
Claim 7
Dependent Claim
27 words
The decolorizable ink according to claim 1, wherein a concentration of the ink composition in the solvent is in the range of 0.1 to 10 wt %.
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) | 2002-07-12 | 2003-01-11 | 2003-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-12 | 2007-01-11 | 2007-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-12 | 2011-01-11 | 2011-07-13 | $7700.00 | Window Closed / Lapsed |