High concentration sodium permanganate etch bath and its use in desmearing and/or etching printed circuit boards
CA 1254493 A · Owner: Morton Thiokol, Inc. · Inventors: Krulik, Gerald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An a? alkaline liquid solution is disclosed consisting essentially of water, at least about 75 grams/ liter of NaMnO4 and NaOH in an amount sufficient so that removal of substantially all of the manganese residues from the surface of a material contacted with the solution can be accomplished by acid neutralization only. The solution disclosed is useful for preparing resinous substrates for metallization.
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 May 23, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 23, 2006.
- 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.