Extended wear pump diaphragm
CA 2251222 C · Owner: Westinghouse Air Brake Company · Inventors: Huss, Howard D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a diaphragm for use in pump applications in which at least a predetermined portion of such diaphragm is in contact with such outer piston which would tend to abrade such diaphragm. Such diaphragm is formed from at least one layer of a preselected flexible material. Such diaphragm comprises an outer bead like portion for securing the diaphragm to a pump housing. There is a annular flexure portion having a first end and a second end such first end and, such second end being generally flat and an arcuate shaped middle portion formed contiguously with the first end and the second end. Such first end is formed contiguously with the outer bead like portion. Such …
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 October 23, 1998 and granted September 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 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.