US5082495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink composition
Assignee: Adger Kogyo Co Ltd
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Filing: 1990-04-02
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Granted: 1992-01-21
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Expires: 2010-04-02
Abstract
Abstract A substantially colorless, transparent ink composition which affords erasable, white ink images includes an organic solvent, an organic substance which is dissolved in the organic solvent, which has a molecular weight of less than 1,000 and which is a white or colorless solid at room temperature, and a polymer which is dissolved in the organic solvent and which has a molecular weight of at least 10,000.
Inventors
- 👤 Zenshiro IIjima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:09
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A substantially colorless, transparent ink composition comprising: (a) an organic solvent; (b) salicyclic acid or acetylsalicyclic acid dissolved in said organic solvent in an amount of at least 15% based on the total weight of said organic solvent said salicyclic acid or acetylsalicyclic acid; and a polymer which is dissolved in said organic solvent and which has a molecular weight of at least 10,000, said ink composition turning white upon use.
Claim 2
Dependent Claim
71 words
A substantially colorless, transparent ink composition comprising: (a) an organic solvent; (b) salicyclic acid or acetylsalicyclic acid dissolved in said organic solvent in an amount of at least 15% based on the total weight of said organic solvent said salicyclic acid or acetylsalicyclic acid; and a polymer which is dissolved in said organic solvent and which has a molecular weight of at least 10,000, said ink composition turning white upon use.
Claim 3
Dependent Claim
27 words
An ink composition as set forth in claim 1, wherein said organic solvent is selected from the group consisting of alcohols, ethers, ketones, esters and halogenated hydrocarbons.
Claim 4
Dependent Claim
20 words
An ink composition as set forth in claim 2, wherein said organic solvent has a boiling point of 50°-100° C.
Claim 5
Dependent Claim
43 words
An ink composition as set forth in claim 3, wherein said organic solvent is selected from the group consisting of methanol, ethanol, isopropyl alcohol, isobutyl alcohol, secondary amyl alcohol, tertiary amyl alcohol, acetone, methyl ethyl ketone, chloroform, dichloroethane, trichloroethane, acetonitrile and mixtures thereof.
Claim 6
Dependent Claim
37 words
An ink composition as set forth in claim 1, wherein said polymer is a member selected from the group consisting of polyethylene oxide, polyvinylpryrrolidone, polyvinylbutylal, polyacrylate, polyvinyl acetate, polyvinyl butyral, phenol resins, shellac, rosin, dammar and copal.
Claim 7
Dependent Claim
26 words
An ink composition as set forth in claim 1, wherein and polymer is polyethylene oxide having a molecular weight of about 10 5 -5×10 6 .
Claim 8
Dependent Claim
45 words
A writing instrument having a porous or fibrous tip and an ink tank which is in fluid communication with said tip and which contains an ink composition according to claim 1, so that a letter or pattern written with said writing instrument is colored white.
Claim 9
Dependent Claim
25 words
An ink composition in accordance with claim 1 wherein said salicyclic acid or acetylsalicyclic acid is dissolved in an amount at least 70-95% of saturation.
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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) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |