Educational demonstration apparatus
CA 2337385 A1 · Owner: Ellse, Peter John · Inventors: Ellse, Peter John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed an educational demonstration apparatus which has a probe. The probe has an end for seating against a surface and a body relative to which the probe is displaceable. The resilient spring has a first end fixed relative to the body and a second end fixed relative to the probe. One of the probes or body has a calibrated scale associated therewith and the other, body or probe has an indicator associated therewith. This probe is inexpensive and simple to use.
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 February 15, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 15, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2023.
- 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.