Liquid-ring gas pump
CA 2187426 C · Owner: Domagalla, Klaus · Inventors: Domagalla, Klaus; Segebrecht, Udo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Liquid-ring gas pump with a working space containing an overhung impeller (17) and a connection casing (2) which is separated from the working space by a control plate (13). This casing contains on one side of a hub space (11), suitable for the accommodation of a mechanical seal (12) an inlet space (5) and, on the other side a discharge, space (6). The discharge space is connected to the working space to allow the recirculation of recirculated liquid. The connection between the discharge space and the working space is passed via the hub space. The hole (19) connecting the discharge space to the hub space is expediently situated on an extension (18) of the discharge space (6), the said …
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 April 18, 1995 and granted July 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 18, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 2017.
- 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.