A clamping spring ring
CA 2291707 C · Owner: Bratthall, Johan · Inventors: Bratthall, Johan; Stahl, Borje; Ogren, Lars
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 mutual locking of two concentric cylindrical parts such as parts to be used in a submergible pump unit. One outer part (10) and two inner parts (6) and (7) are locked mutually by help of a circumferential locking element (12) having resilient abilities and which is arranged at the intersectional point between the three parts (6) (7) and (10).
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 December 3, 1999 and granted June 10, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 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.