Voice communication unit
CA 2005351 C · Owner: Noetzel, Walter R. · Inventors: Noetzel, Walter R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A voice communication unit is mounted with respect to a full face mask to allow the wearer of the mask to communicate with others. An optical transmitter positioned inside the mask responds to the user's voice to transmit an optical signal through the face lens of the mask. A receiver located outside the mask and optically coupled to the transmitter is responsive to the optical signal and generates a sound corresponding to the user's voice. A timer in the transmitter limits the operating period of the communication unit. The receiver includes volume control circuitry for maintaining the generated sound to a relatively constant level.
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 December 13, 1989 and granted April 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2011.
- 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.