Method for regulating the amount of air supplied to a gas mask and a gas mask, in which this method is implemented
CA 1308624 C · Owner: Ponkala, Jorma · Inventors: Ponkala, Jorma
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to 2 method by which the amount of air supplied to a gas mask is kept essentially constant by using the fan motor (1) as a sensor, with the aid of which its power is regulated. The electronic regulation circuit of the invention keeps the air amount constant by regulating the pulse width ratio of the voltage (U1) operating over the motor. The light emitting diode (LED) connected to the control circuit detects when the fan motor is unable to produce the selected amount of air. In order to prevent deep discharge of the battery, the voltage supervising circuit (6) interrupts the current supply to the device when the supplied voltage (SJ) drops below the set limit value. …
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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 October 13, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 2009.
- 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.