Valve cap pressure drop indicator
CA 2033926 A1 · Owner: Kramer, Robert · Inventors: Hart, Henry Clay, Iii; Kramer, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tire pressure indicator for visual observation of tire pressure including a screw-on cartridge containing a springbiased piston with a movable shield which covers a central indicator pilot when tire pressure is Up to requirements. When pressure is below what it should be, the piston retracts to allow the shield to expose the indicator pilot to the view of an observer, thus serving as a warning that inflation is required. The cartridge is composed of three elements: a screw on base intermediate element and a transparent sealed top cap. A cupshaped vessel is movable in the intermediate and top cap sections in response to a subjacent diaphragm and pressure in the tire.
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 January 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 10, 2013.
- 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.