Process for non-polluting spray painting with a dispersion of oven drying paint in water
CA 2050480 C · Owner: Unicolor Ag · Inventors: Schlumpf, Georg; Wepf, Hanspeter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
When painting in a spray booth (1) with water flowing down the rear wall (2), the waste water from the booth is divided into permeate and paint-containing residue by ultra-filtration (13). The permeate is recycled. Fresh paint dispersion is supplied. The paint is preferably an alkyd resin or a combination of alkyd and acryl resin. The dispersion contains a coalescence-inhibiting component preferably one or more aliphatic amines with an average molecular weight of 75 to 133 or their mixtures or derivatives, and a drying inhibition component. The waste water from the booth contains a penetration adjusting component, preferably a glycol derivative. The dispersion and/or the waste water from …
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 August 15, 1990 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 15, 2012.
- 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.