A submersible machine
CA 2264385 C · Owner: Brandt, Bengt-Ake · Inventors: Fredriksson, Boris; Brandt, Bengt-Ake
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a device for a submersible machine such as a pump, a, turbine or a mixer. The machine comprises a driving unit (1) and a hydraulic unit (2) having an impeller, connected to the driving unit via a rotary shaft (3). In order to prevent the medium in, the hydraulic unit from entering the driving unit along the driving shaft an, intermediate seal device is arranged The seal device comprises two mechanical face seals (5) and (6) and an intermediate room (7) containing barrier liquid. In order to prevent possible leaking, barrier liquid from damaging the shaft bearing (4) a storage tank (9) for , collecting, said liquid is arranged within the room (7)
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 March 3, 1999 and granted April 15, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 3, 2021.
- 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.