Cam-helical actuator with backlash elimination
CA 2000220 A1 · Owner: Weyer, Paul P. · Inventors: Weyer, Paul P.; Weyer, Paul P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, The fluid-powered actuator having a body an, axially extending rotatable shaft with a plurality of helical grooves, and an annular piston sleeve reciprocally mounted within the body and receiving the shaft therethrough. The piston sleeve has a plurality of radial bores extending fully therethrough with an inward open end adjacent to the grooved shaft. Guide pins are rotatably disposed in each of the piston sleeve bores and ride in the shaft grooves. An annular carrier is reciprocally mounted within the body coaxial with the piston sleeve and is adjustably axially movable relative thereto. The carrier has a plurality of radial bores extending fully therethrough …
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 5, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 5, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2011.
- 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.