Cleaning composition and processes suitable for replacing grit blasting to clean metal mold surfaces for plastics
CA 2198312 A1 · Owner: Stuart, Michael A. · Inventors: Stuart, Michael A.; Jarema, Chester P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Residue that accumulates on metallic molding surfaces during repeated molding of plastics such as PVC can be removed by cleaning with an aqueous solution of a glycol or oligo-glycol monoether, an amine, and a chelating agent. The cleaner is sufficiently effective to replace mechanical blasting that was previously required.
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
- Filed February 24, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 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.