Timer
CA 2276825 A1 · Owner: Bay, Ronald W. · Inventors: Bay, Ronald W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Timer is provided for allowing a teacher to control the absence of a student in a classroom. The timing device has a main body for mounting the timing, device in the classroom, at least one signal member located on the main body and, arranged to actuate a signal to indicate to the teacher at a predetermined time and, an activation and marker member. The student removes the activation and marker member when leaving the class room thus activating the timer and places the marker on the students desk for identification. If the student returns in good time, the student on return replaces the marker on the body thus deactivating the timer on, the main body. If the student is overtime the …
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 5, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 5, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 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.