Synthetic turf with wide grass-like pile interspacing
CA 2095158 C · Owner: Prevost, Jean · Inventors: Prevost, Jean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A playing surface for field sports games comprising: a firm, stable subsurface; a pile fabric having a flexible backing supported by the firm subsurface and normally upstanding grass-like piles the length of the piles being substantially uniform and lying in the range from 0.375 to 3 inches wherein, the piles further define an interspacing gap between any two successive piles, .sigma. whereby: 0.75 inch ~ .sigma. < 1.25 inch; and a top-dressing layer, comprising ordinary sand, interspersed among the piles to a, substantially uniform depth at least half the length of the piles.
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 April 29, 1993 and granted July 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2015.
- 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.