Method and apparatus for attenuating compressor noise
CA 2574018 C · Owner: Cardinal Health 203, Inc. · Inventors: Devries, Douglas F.; Williams, Malcolm R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention comprises a method and apparatus for reducing the noise generated by , compressors, including Roots-type blowers used in mechanical ventilators. A noise-attenuating , gas flow path for a compressor is contained in a portable ventilator housing. The gas flow path comprises chambers interconnected by flow tubes. The flow path is , folded so as to fit into the limited space of a portable ventilator housing. The dimensions , of the chambers and the flow tubes are selected so that an impedance mismatch is created , between the chambers and the flow tubes. The flow path comprises one or more perforated tubes located in one or more of the chambers. The perforated tube has a …
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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 July 29, 2005 and granted May 6, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 29, 2025.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.