Disposable petri dish with reinforcement ribs
CA 2030680 A1 · Owner: Hall, David · Inventors: Hall, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A Petri dish is disclosed in which the flat bottom is provided with a plurality of preferably radial ribs. The upwardly projecting portions of the ribs do not project more than about 0.050 inches above the upper surface of the bottom. Preferably the ribs do not project more than about 0.030 inches above the upper surface of the bottom. The thickness of the bottom portion other than at the ribs is not greater than about 0.030 inches. Preferably this thickness is not greater, than about 0.025 inches. In the preferred embodiment there are at least three, radial ribs. Preferably there are four ribs which are spaced 90 degrees from each other. A lid having the same basic structure may also be …
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 November 27, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2012.
- 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.