Mulching device
CA 2277637 C · Owner: Puspurs, August · Inventors: Puspurs, August
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mulching structure for covering the soil around the stem of a growing plant and, over the roots thereof to screen sunlight from the adjacent soil and thus minimize the, growth of weeds. The mulching structure also allows water from irrigation or rain to flow, therethrough to the soil. The mulching structure includes a first wall made out of a, substantially impermeable material. The first wall is provided with a first wall aperture, extending therethrough. The mulching structure also includes a second wall made out of a, substantially impermeable material. The second wall has a second wall aperture extending therethrough. A wall spacing structure extends between the first and …
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 July 21, 1999 and granted September 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 21, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 21, 2021.
- 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.