Rigid four radii rim paper plate
CA 2077636 C · Owner: Littlejohn, Mark B. · Inventors: Littlejohn, Mark B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
20-, A pressed paper plate includes a planar center 12 which forms a bottom for the plate and has an outer peripheral surface 13. An outwardly projecting side wall 14 includes a first rim portion 14A which is convex upward and is joined to the outer peripheral surface of the planar center, and a second rim portion 14B which is convex downward and is joined to the first rim portion. A third rim portion 16A, which is joined to the second rim portion of the outwardly projecting side wall and a fourth rim portion 16B which is provided for forming an outer edge for the container are both convex downward. The arc lengths and radii of the first second, third and fourth rim, portions are selected …
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 September 4, 1992 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 4, 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.