Environmental protection method for reducing pollution of substrate surfaces
CA 2033708 C · Owner: Hinspergers Poly Industries Ltd. · Inventors: Hinsperger, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention discloses a protective method suitable for reducing the environmental impact of treatments in an area such as turf areas by applying a protective layer of a flexible material to the area to be protected. The protective layer is a length of thermoplastic sheet material free from apparent apertures when in a lay-flat condition but which has slits formed in the material to permit the passage of moisture such as would be encountered in a rainfall; the material is of a type which permits the passage of sunlight through to the protected area to permit it to grow.
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 7, 1991 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 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.