Patent US4744826A successfully refreshed from Google Patents.
US4744826A
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Ink composition
Assignee: Adger Kogyo Co Ltd
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Filing: 1986-07-29
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Granted: 1988-05-17
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Expires: 2006-07-29
Abstract
Abstract An aqueous transparent ink composition affording white ink patterns which are erasable with weakly acidic or ammoniacal liquid, and including an aqueous medium, and an ammine complex salt of zinc dissolved in the aqueous medium.
Inventors
- 👤 Zenshiro IIjima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:57
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
A colorless, transparent ink composition consisting essentially of an alkaline aqueous medium and an amine complex salt of zinc dissolved in said aqueous medium, said complex salt being the reaction product of ammonia and zinc hydroxide, said ink composition turning white upon use.
Claim 2
Dependent Claim
43 words
A colorless, transparent ink composition consisting essentially of an alkaline aqueous medium and an amine complex salt of zinc dissolved in said aqueous medium, said complex salt being the reaction product of ammonia and zinc hydroxide, said ink composition turning white upon use.
Claim 3
Dependent Claim
31 words
An ink composition as claimed in claim 1, further comprising a drying-preventing agent selected from the group consisting of glycerin, alkylene glycols and polyalkylene glycols having a molecular weight of 200-300.
Claim 4
Dependent Claim
22 words
An ink composition as claimed in claim 1, wherein the amount of said ammine complex salt of zinc is 0.5-30% by weight.
Claim 5
Dependent Claim
14 words
An ink composition as claimed in claim 1, and having a pH of 8-14.
Claim 6
Dependent Claim
19 words
An ink composition as claimed in claim 2, wherein the amount of said drying-preventing agent is 2-25% by weight.
References Cited (Backward Citations)
US4154618A
Cited
US4243430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |