Method to clean ink and coating from contact cleaning rolls
CA 2216547 C · Owner: Wisniewski, Carl A. · Inventors: Wieloch, Francis J.; Wisniewski, Carl A.; Smallman, Gary W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and cleaning system to clean ink and coating from contact cleaner rolls. The contact cleaning rolls are located on a turret and as, one contact cleaning roll is indexed sequentially out of contact with the imaging surface and into contact with a porous material another contact cleaning roll is indexed into contact with the imaging surface simultaneously. The porous material has a non-alcoholic solvent applied to clean the contact cleaning roll surface upon contact. The components found to create an efficient cleaning solvent for the CCRs include aliphatic ketones and alkylene halides. The aliphatic ketones are alkyl ketoses containing from about 1 to 25 carbon atoms (with a …
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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
- Filed September 23, 1997 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2019.
- 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.