Apparatus for measuring human respiration
CA 1209821 A · Owner: Chesebrough-Pond'S Inc. · Inventors: Greenberg, Mishel; Chernak, Milton; Smyers, William H. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an inhalation device for use in inhalation of air into human lungs. The device comprises a first hollow cylindrical chamber for slidably receiving a piston, the chamber being vented to the atmosphere; and a movable piston assembly within the cylindrical chamber. At least a second hollow chamber is sealed from fluid communication with the first chamber, the second chamber communicating with the atmosphere. A breathing tube assembly is adapted to be in communication with said first and second hollow chambers. Connecting means connecting the breathing tube assembly with the first chamber and the second chamber for inhaling air from the first and the second chambers. A …
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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 August 19, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 19, 2003.
- 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.