Construction for supporting a flexible sheet
CA 2030719 C · Owner: Engineering Dynamics Ltd. · Inventors: Pick, William E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A construction for supporting a flexible sheet(56) is disclosed, which construction includes a U-shaped channel(34) having opposed flanges(40,42) that are adapted to receive a complementary spline member(50) for frictionally engaging a flexible sheet(56) such, as window screen, between a surface of the spline member(50) and an adjacent inner surface of one flange of the U-shaped channel(34) The, structure has several practical applicationons including the assembly of window screen frames, electrostatic air filters of the charged media type, frames for storm windows of plastic film and the like. An improved construction for an electrostatic air filter of the charged media type, which air …
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 November 23, 1990 and granted February 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 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.