Process for coloring wood
CA 1305592 C · Owner: Leach, Robert M. · Inventors: Leach, Robert M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for coloring wood whereby the resulting color will not change or substantially fade upon exposure to long term environmental weathering which process comprises contacting the wood with an aqueous solution containing 0.01%-10% of an iron salt derived from a mono-, di-, or tri-carboxylic acid or a mono-, di-, or tri-carboxylic hydroxy acid containing 1-6 carbon atoms. The iron salt solution of this invention may be used to color nontreated wood as well as wood treated with known preservative compositions containing one or more heavy metals including copper, chromium, arsenic and zinc.
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 July 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 28, 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.