Erasable ink composition for writing on impervious surface
Patent 5324764 Issued on June 28, 1994. Estimated Expiration Date: 
January 19, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 19, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3834823 Erasable ink composition Erasable ball-point pen ink Washable solid marking composition Patent #: 4978390 InventorsAssigneeApplicationNo. 005974 filed on 01/19/1993US Classes:524/377, Two or more OH groups106/31.64, Erasable, purified, correctable, fugitive, indicator, conductive, fluorescent, chromogenic, or magnetic composition106/31.73, Rosin or derivative containing106/31.74, Shellac or derivative containing106/31.86, Organic oxygen compound containing523/161, Invisible, ballpoint, or typewriter ink compositions or process of preparing; or composition for correction ribbons or correction fluids or process of preparing524/376OH group, e.g., ether-alcohol solvent, etc.ExaminersPrimary: Lieberman, PaulAssistant: Einsmann, Margaret Attorney, Agent or FirmForeign Patent References
International ClassC09D 011/16Foreign Application Priority Data1992-01-17 JPAbstractAn erasable ink composition for writing on an impervious writing surface comprising an organic solvent, a resin, a pigment, and a separating agent which comprises:(a) a polyoxyethylene polyoxypropylene block copolymer, as a first separating agent, which is liquid at normal temperatures in an amount of 5-20% by weight, and(b) at least one organic compound selected from the group consisting of a carboxylic acid ester, a polyoxypropylene monoalkyl ether and a polyoxyethylene polyoxypropylene monoalkyl ether, as a second separating agent, which is liquid at normal temperatures in an amount of 2-10% by weight.Field of SearchInvisible, ballpoint, or typewriter ink compositions or process of preparing; or composition for correction ribbons or correction fluids or process of preparingSolid block or solid block-type copolymer with other solid polymer, SICP or SPFI OH group, e.g., ether-alcohol solvent, etc. Two or more OH groups | |
