Improved conical diaphragm and method of making
CA 2090384 C · Owner: Spalding, Willard P. · Inventors: Spalding, Willard P.; Scott, Daniel G.; Mong, William K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fabric reinforced molded conical diaphragm and method of making in which the parting line of the diaphragm mold is arranged such that the flashing and reinforcing fabric of the molded diaphragm are on the sidewall of the outer clamping bead at a location displaced from the juncture of the sidewall and the bottom surface thereof so, that upon inverting the diaphragm member the fabric free, bottom surface of the clamping bead is transposed to the sidewall of the diaphragm clamping bead thereby providing, a smooth, accurately sized outer periphery of the diaphragm to facilitate its assembly.
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 February 25, 1993 and granted March 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2015.
- 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.