Apparatus for use in the manufacture of valves for hydraulic power steering gears
CA 2101744 C · Owner: Bishop, Arthur Ernest · Inventors: Bishop, Arthur Ernest
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for measuring and recording the angular position of the edges of axially extending grooves (18) disposed on an inside cylindrical bore surface or outside cylindrical surface of a workpiece (10) characterized in that the apparatus includes a shoe (82), pressed into intimate contact with the surface over a zone (85) of the shoe, the zone (85) incorporating an orifice (84) extending, away from the zone (85) of intimate contact to a plenum chamber (88, 97), to which fluid is supplied relative rotation between the workpiece (10) and the shoe (82) being produced a measuring de-, vice (not shown) to measure the degree of restriction to flow of fluid from the orifice (84) as the edges …
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 October 28, 1991 and granted March 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2013.
- 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.