Voice transmission adaptor assembly
CA 2176355 C · Owner: Actron Manufacturing Company · Inventors: Birli, Joseph A.; Becker, Jack J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A voice transmission system for a protective respirator having a face mask (14) with an inhalation port (26) and a filter (16) attached to the inhalation port, is provided. The voice transmission system (12) comprises a microphone assembly adapted to be located between the inhalation port and the air filter the microphone assembly including a spacer (18) for separating the filter from the inhalation port and a microphone (20) extending therefrom and into an interior space of the face mask and a combined amplifier/loudspeaker assembly remotely connected to the microphone. The spacer of the microphone assembly provides an airtight seal between the filter and face mask. The spacer is provided …
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 August 30, 1994 and granted May 21, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 2016.
- 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.