Compressor having capacity-controlling mechanism with abrasion-free cylinder
CA 2254057 C · Owner: Mitsubishi Heavy Industries, Ltd. · Inventors: Ishii, Mikihiko; Kawada, Minoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compressor having a capacity-controlling mechanism (37b) is provided by, which the inner-peripheral surface of a blind opening provided in a piston (34b) is subjected to abrasion due to sliding and rotating motions of a coil spring (41b) in the piston. In the capacity-controlling mechanism the coil spring is covered by a cover, (50) made of abrasion resistant material and the covered coil spring is arranged in the blind opening, or a head of the coil spring is engaged to an inner surface of the blind opening.
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 November 12, 1998 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2020.
- 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.