Tubular refrigerant check valve with indented outer housing portion
CA 2228090 C · Owner: Tang, Punan · Inventors: Jakobs, Diane M.; Tang, Punan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A check valve connectable in a refrigerant line is economically fabricated from only three parts - (1) a copper tubing body connectable in the refrigerant line (2), a nonmetallic shutoff ball, and (3) an annular valve seat member having a conically tapered seating surface on one of its ends. The seat member is coaxially received within a first end of a longitudinally central portion of the tubing positioned between spun-down opposite end portions thereof with the seating surface end of the seat member facing the second end of the central tubing portion and the ball, being received in the central tubing portion for axial movement into and out of sealing engagement with the seating surface. …
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 January 28, 1998 and granted May 15, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 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.