Low reexpansion valve system
CA 2063465 A1 · Owner: Tecumseh Products Company · Inventors: Gannaway, Edwin L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A scotch yoke compressor including a valve system wherein an annular discharge port is defined by an opening in the valve plate and a washer attached to the cylinder head. A valved piston includes a valve retainer having an annular protuberance that extends above the piston head and is received within the annular discharge port when the piston is at top dead center, thereby reducing reexpansion volume.
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 19, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2014.
- 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.