Shutter device for pressure containers
CA 2071487 C · Owner: Nishimura, Takashi · Inventors: Kawahito, Akiyoshi; Akune, Takeshi; Hondo, Kazusi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shutter device for a pressure container was developed to solve a problem with the limited space necessary for installing large pressure vessels of various types in a factory, since known cover apparatuses for a pressure vessel require a large space for transferring a lid body when opening the vessel. The shutter comprises a lid assembly constituted of a seal plate formed of a flexible, material of a size fit for the opening of a pressure vessel and a multitude of beam, members attached to the outer surface of the plate and extending widthwise. The beam members are connected to the seal plate in such a manner as to be parallel to each other along a reference line for connection extending …
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 October 25, 1990 and granted January 26, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 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.