Use of solids as blocking additives in marking fluids
CA 1332655 C · Owner: Dataprint R. Kaufmann Gmbh · Inventors: Kaufmann, Rainer; Herrnring, Gunther
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of preventing the blockage of writing instrument fluid outlets, and a marking fluid according to such method are provided, whereby a solid antiblocking additive is added to the solvent or solvent mixture of a marking fluid. The solid crystallizes at the fluid outlet forming a boundary which hinders evaporation of the writing fluid's solvent. The boundary formed is thin and soft such that upon recommencement of writing the boundary is broken and no reduction in writing quality results.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted October 25, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 25, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.