Top-entry check valve having spring retainer
CA 2074455 C · Owner: Scaramucci, John Philip · Inventors: Scaramucci, John Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A top-entry check valve has a valve chamber containing a seat cage, disc and utilizes a spring retainer to prevent movement of the seat, cage and disc in the downstream direction. A removable bonnet covers an access opening the valve chamber. The seat and cage are a unitary structure for ease in replacing the seat and cage. An annular shoulder in the valve body prevents movement of the seat, cage and disc in the upstream direction. The spring retainer is secured in the valve body by engagement with a lug in the valve body, the unitary seat and cage the access opening in, the valve body and the bonnet. Removal of the bonnet allows access to the valve chamber for replacement of the seat cage, …
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 July 22, 1992 and granted November 1, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 22, 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.