Combination shut-off valve and flow control valve with side access and viewing port for observation, testing and on-line servicing

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 February 25, 1975. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 25, 1992.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.