Periscope viewing device incorporating a speaking tube
CA 2488574 C · Owner: Bolland, Matthew T. · Inventors: Bolland, Matthew T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A viewing device includes a housing defining an interior chamber through which light can pass. The housing includes first and second spaced apart openings communicating with the interior chamber such that light entering the first opening is viewed by a user looking into the second opening. The second opening is further configured to receive sound created by the user and the housing is configured to transmit the sound entering the second opening toward a sound exit location of the housing at or near the first opening. The second opening can define an eyepiece portion into which the user looks and a mouthpiece portion into which a user speaks. The viewing device can take the form of a …
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 November 30, 2004 and granted January 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2024.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.