Ultrasonic removal of contaminants from boreholes of printed circuit boards
CA 1307353 C · Owner: Meyer, Walter · Inventors: Meyer, Walter; Grapentin, Hans-Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the removal of contaminants from holes of printed circuit boards using oxidants, such as permanganates in aqueous solutions and/or swelling (soaking) agents as well as employing an ultransonic treatment wherein the boards are passed horizontally during the treatment.
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 September 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 2009.
- 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.