Valving technique
CA 1297167 C · Owner: Chief Industries, Inc. · Inventors: Kreitler, Thomas E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To reduce the amount of inert gas wasted during arc welding, the inert gas flowing through a conduit to the tip of the welding torch is blocked or released at a first location in the conduit by a solenoid controlled valve and regulated at a second location in the conduit with a precision flow rate regulator with a tolerance of at least 1 1/2 cubic inches per hour. The dead space between the solenoid controlled valve and the flow rate regulator is less than 4 cubic feet. The regulator is setable at any of a plurality of positions representing flow rates of inert gas.
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 March 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 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.