Wire and felt cleaning
CA 1319078 C · Owner: Clifford, Richard Purdie · Inventors: Schenker, Achim; Cullen, Theresa; Clifford, Richard Purdie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition and method for cleaning papermill wire and felt are disclosed which use surprisingly effective combinations of organic cleaning components such as N-methyl-2-pyrrolidone and ?-butyrolactone (and certain of their structurally related compounds) with an alkali, such as sodium metasilicate and sodium hydroxide land other alkali metal hydroxides) in both, water and an organic cosolvent such as isopropanol acetone, and 2-butoxyethanol (and other glycol ethers).
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 June 15, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 15, 2010.
- 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.