Oil return system and method
CA 1100319 A · Owner: Carrier Corporation · Inventors: Young, Eugene E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Oil Return System and Method, Abstract A refrigeration system including an oil return system for a refrigerant compressor for returning oil accumulated within a first portion of the compressor operating at refrigerant discharge pressure to a second portion of the compressor operating at substantially suction pressure. The oil return system includes a first conduit connecting the first portion of the compressor with the second portion thereof, for delivering lubricating oil accumulated within the first portion to the second portion. A normally closed valve is interposed in the conduit for controlling flow of lubricating oil through the conduit. The magnitude of the pressure in the second …
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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
- Granted May 5, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 5, 1998.
- 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.