Quickly movable elastically engaging screw-and-nut mechanism
CA 2198244 C · Owner: Chaolai, Fan · Inventors: Chaolai, Fan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A new type of screw-and-nut mechanism comprises a supporting seat one or more , semi-nuts and the actuating means thereof characterized in that the , engagement of internal thread on the semi-nut with external thread on the screw is started elastically, then completed and locked by a positive element and that the disengagement thereafter of the related elements is accomplished positively. Such a mechanism can be used in various kinds of jacks vices, sliding tables of machine tools as well as other devices which is driven by a screw and desired to pass through its return travel quickly.
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 August 18, 1995 and granted May 21, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 18, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 2017.
- 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.