Roof window and a large room installation with a number of such windows
CA 2002780 C · Owner: Velux Industri A/S · Inventors: Nielsen, Elgard Schandorff; Jensen, Arne Brandt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The upper horizontal main frame member (1) of a roof window is designed as a hollow box-like structure comprising an inner ventilating compartment (12) which through a flow passage (18) provided with an adjustable damper (19) communicates with an outer ventilating compartment (13) with air exhausts (20 21) positioned, at both end walls (22, 23) of the box-like structure in the outer side of the roof. An improved aeration is thereby obtained which is also effective when the window is provided with a rolling louver assembly (15). An exhaust fan (26) may be accommodated in the inner ventilating compartment (12) and the structure may be provided with separate remote-controlled motors for the …
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 10, 1989 and granted June 1, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2011.
- 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.