Multiple phase stethoscope
CA 2176168 C · Owner: Baffoni, Frank A. · Inventors: Baffoni, Frank A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multiple phase stethoscope has a chest piece with a plurality of diaphragms and an equal plurality of sound compartments. Sound is carried from each of these compartments through a separate lumen, the plurality of lumens making up a tube assembly. The lumens are at least partially separated from each other by a flexible membrane which serves as a transducer to convert acoustic energy into mechanical motion, thus allowing the sound in the lumens to be combined. One of the lumens is open to the atmosphere through ear pieces, while the other lumen is sealed with a material and/or pressure different from the ambient environment. The geometry of the diaphragms the second, compartments, and the …
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 May 9, 1996 and granted March 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2018.
- 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.