Wiper for a rotary disk valve
CA 2077415 C · Owner: Victaulic Company Of America · Inventors: Mclennan, William Ross
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotary valve has a wiper member formed from an elastomeric material, the wiper member extending circumferentially of the valve seat, and in an unstressed, condition of the wiper member extending radially inwardly, of said valve seat the wiper member being operatively, positioned for it to wipe clean an outer circumferential surface of the valve member as the valve member is moved from an open position to a closed position the wiper member, being supported for limited movement relative to the valve seat, whereby, upon stressing of the wiper member by the valve member, the wiper member can retract into the valve seat.
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
- Filed September 2, 1992 and granted February 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 2, 2014.
- 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.