Improved block and tackle sash counter balance
CA 2356414 A1 · Owner: Damani, Manish · Inventors: Damani, Manish
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is an apparatus and method of assembling a block and tackle counter balance for windows that reduces the cost of manufacture and installation. In particular, the balance provides vertical support to a window sash, using a semi-rigid channel, a top shoe for insertion into one end of the semirigid, channel, and a bottom shoe for insertion into another end of the semi-rigid channel. Connected to the top shoe is a spring and a block and tackle pulley assembly is, connected between the bottom end of the spring and the bottom shoe wherein a, cord from the pulley assembly extends outward from the bottom shoe for connection, to the window sash.
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 August 31, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 31, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 2023.
- 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.