Method for obtaining engravers template
CA 1101732 A · Owner: Swiss Aluminium Limited · Inventors: Stewart, John V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method for obtaining an engravers template having a desired pattern therein with engraved portions and raised portions. An aluminum sheet is provided having an aluminum oxide layer on one side and a plastic layer on the opposite side. The desired engraved pattern is etched through the oxide layer and through the aluminum sheet. In accordance with a further embodiment, a further aluminum sheet can be disposed on the other side of the plastic layer, and an aluminum oxide layer is formed on the free side of the second aluminum sheet. The second oxide layer is covered with a further plastic layer to protect the second oxide layer during the etching steps.
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 26, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 1998.
- 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.