Indicator device
CA 1322945 C · Owner: Fehder, Carl G. · Inventors: Fehder, Carl G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rapid response device for the detection of carbon dioxide in a concentration of more than 2% in a gas mixture comprising an indicator component 9 mounted within an enclosure 1 with a transparent window, said component comprising a carrier having fixedly attached thereto an indicating element formed from an aqueous solution of a colorless base a, hygroscopic, high boiling, transparent colorless, water-, miscible liquid and a pH-sensitive indicator the enclosure, being sealed for storage with sealing means 14.
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
- Granted October 12, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 12, 2010.
- 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.