Process for imparting an electrostatic charge to powders to render them useful for coating applications
CA 2201878 C · Owner: Harpur, Ian · Inventors: Hearn, Graham; Williams, Barbara E.; Harpur, Ian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for imparting an electrostatic charge to organic powders to render them useful for powder coating applications, which comprises forming a blend of said powders and a polyalkylene ether as an electrostatically active modifying agent to improve the charge on said powders, and subjecting said blend to electrically inductive or conductive conditions, wherein said powders have a resistivity of from about 10 9 to about 10 13 ohm-meters at about 20 percent relative humidity. The electrostatically active modifying agent may also be a polyalkylene glycol or a polyethoxylated stearyl alcohol.
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 October 3, 1995 and granted December 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 3, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 3, 2017.
- 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.