Hydraulic tensioner
CA 2189034 C · Owner: Junkers, John Kurt · Inventors: Junkers, John Kurt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic tensioner for tensioning a threaded connector has a substantially tubular (1) having an axis, one axial end to abut against an object, and another opposite axial end, a substantially tubular engaging element (2) arranged radially inside the housing (1) so as to form a space therebetween and provided with engaging means (11) for engaging a threaded connector, a plurality of pistons (4, 5, 6; 5', 6'; 5", 6"; 26 27, 28) arranged in the space and spaced axially from one another so as to form a plurality of chambers in the space, and passages (8 9, 10) for supplying a working liquid into the chambers whereby when the housing abuts against the object in one axial direction the, …
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 March 8, 1996 and granted January 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 8, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 2018.
- 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.