Ground cover
CA 2108973 A1 · Owner: Pollard, Neil G. · Inventors: Johnson-Marshall, Jeremy; Johnson-Marshall, Jeremy; Pollard, Neil G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ground cover (1) for protecting the grass of sports fields includes a plurality of tubes (2) joined together along seams (3) and having open ends (6) and partially closed ends (7). In use air , is pumped into the cover (1) through an inflation inlet (4) and passes into a distributing tube (5) from which it enters all the other tubes (2). The ends (6) are greater in height than the ends (7) of the tubes (2) so as to provide a slope down which rainwater may fall. With the tubes (2) inflated a subatmospheric, pressure is created beneath the cover by extracting air through an outlet (8), and the reduced air pressure draws the cover onto the ground, thus opposing wind forces which may tend to …
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, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2014.
- 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.