Breathing apparatus
CA 1237625 A · Owner: Hall, Lester B. · Inventors: Hall, Lester B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Breathing apparatus comprising a mask for defining a breathing chamber in communication with the nose of the user a, gas supply container having a movable valve control element and, an operator manipulated by the mouth of the user for moving the control to open the valve to introduce gas to the breathing chamber. As a result, control of the gas supply is provided by the mouth of the user and inhaling from and exhaling to the chamber is through the nose of the user. The mask is shaped to contact the user's face around the nose and to define the breathing chamber in communication therewith and the container of, breathing gas is carried by the mask with the outlet valve communicating with 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
- Granted June 7, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 7, 2005.
- 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.