Directional microphone assembly
CA 2364120 C · Owner: Schulein, Robert B. · Inventors: Monroe, Timothy S.; Schulein, Robert B.; Killion, Mead C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A microphone capsule (40) for an in-the-ear hearing aid is disclosed. The capsule (40) can include a top plate (80) having first and second spaced openings defining front and rear sound inlets (83 84), and a directional , microphone cartridge (20) enclosing a diaphragm (21). The diaphragm (21) is oriented generally perpendicular to the top plate and divides directional microphone cartridge housing into a front chamber (22) and a rear chamber (24). A front sound passage (85) communicates between the front sound inlet and the front chamber, and a rear sound passage (86) communicates between the rear sound inlet and the rear chamber. Front and rear acoustic damping resistors (81, 82) …
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 February 16, 2000 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2022.
- 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.