Panel shutter assembly
CA 2033629 C · Owner: Yagi, Fumio · Inventors: Kondoh, Kohichi; Yagi, Fumio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a panel shutter assembly including a plurality of shutter panels which are movable up and down along a pair of transversely spaced upstanding guide rails a, pair of chains to which the panels are fastened one after another, a set of sprockets engaging the chains for moving the chains in either direction to move the panels to open and close a shutter opening, and a pair of panel supporting rails from which the panels are suspended in a panel storage space when the shutter opening is opened the, sprockets consist of a pair of first sprockets for moving the panels up and down and a pair of second sprockets spaced horizontally apart from the first sprockets and provided between the first …
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 January 4, 1991 and granted May 19, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 2013.
- 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.