Piston unit with rolling membrane
CA 2019976 C · Owner: Bordini, Giorgio · Inventors: Bordini, Giorgio; Santi, Franco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Piston units with rolling membrane are used for the handling of liquid products which require good hygiene e.g. foodstuffs such as milk products. In a piston unit used as a pressure-compensating device pressure variations in a product line are dampened in that the side of the piston remote from the product line is subjected to a variable air pressure. Rolling membranes are positioned on both sides of the piston and enclose between them a chamber which is connected to a source of vacuum so as to secure contact of the membranes with the piston. The vacuum is distributed in the chamber with the help of a vacuum line with enlarged outlet area, and is distributed over the end faces of the piston …
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 June 27, 1990 and granted April 30, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2012.
- 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.