Green-house curtain
CA 1268698 C · Owner: Ludvig Svensson International Bv · Inventors: Henningsson Goran; Hellgren, Olof
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A greenhouse screen with high light resistance and good weathering characteristics. The purpose is to achieve a greenhouse screen which combines the characteristics of a shadow curtain and a blackout curtain and in certain cases also an energy curtain. These goals have been achieved through letting the screen at least partly consist of a material which in one or more layers is sunshine absorbing in a significant part of the wavelength interval 575-800 nm, preferably with a maximum in the interval 600-750 nm, while the photosynthesis light of the sunshine in the wavelength interval 400-575 nm is mainly transmitted through the material.
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
- Granted May 8, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 8, 2007.
- 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.