Multipurpose field moving method and apparatus
CA 2208376 C · Owner: Tsutsui, Taizo · Inventors: Sugiyama, Shinichi; Tsutsui, Taizo; Murakawa, Sadaaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method and apparatus for moving a multipurpose field the multipurpose field is made to float above a basic floor plate using fluid pressure and can be moved and placed in a desired position by delivery means. The moving apparatus comprises a plurality of nozzles provided in the basic floor plate common to a field region of a roofed stadium and an outdoor region for detecting the presence of the multipurpose field and for jetting a fluid upward in response to a detection signal and delivery means for alternately moving the multipurpose field between both the regions.
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 June 20, 1997 and granted January 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2019.
- 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.