Tire pressure monitoring device
CA 2429593 A1 · Owner: Lundqvist, Torbjorn B. · Inventors: Lundqvist, Torbjorn B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A low tire pressure monitoring device that is affixed to a tire valve stem (22) and methods of using the same. The monitoring device comprises a housing (26) having a counter-pressure chamber (21) a main pressure chamber (94), and , a flexible membrane (36) that separates the two chambers. The monitoring device is calibrated by trapping the tire initial air pressure in the counter pressure chamber (21). The air pressure within the main pressure chamber (94) is equivalent to the air pressure within the tire. Over the course of time the air pressure within the tire and concomitantly the air pressure within the main pressure chamber decreases. When the pressure in the counter pressure …
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 21, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 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.