Collapsible mandrel
CA 2299487 C · Owner: Siilats, Lembit · Inventors: Siilats, Lembit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel construction of collapsible mandrel is described the outer wall of , which, comprises a plurality of sections with mating edge surfaces that diverge inwardly, on odd-numbered sections and convergently on the alternating even-numbered sections of the mandrel wall, so that the odd-numbered set of sections may be retracted by a predetermined first amount than the even-numbered wall sections by a predetermined, lesser second amount. The collapsible mandrel is useful in a number of applications, such as the production of filament wound containers. In a particular embodiment of the invention the retractible , sections, make up the walls of a vertically-oriented cylindrical retractible …
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 24, 2000 and granted August 27, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 24, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2022.
- 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.