Muffler with acoustic absorption insert for limited clearance pneumatic device applications
CA 2371112 A1 · Owner: 3M Innovative Properties Company · Inventors: Hilling, George D.; Tredinnick, Kenneth F.; Blette, Russell E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A muffler (20) for attenuating noise produced by a pneumatic device having limited clearance. The muffler (20) includes a housing (22) a base (24) and , an acoustic absorption insert (100). The housing (22) defines an upstream end and a downstream end (34), with the downstream end (36) being closed. Further the housing tapers from a maximum width of less than approximately 1.5 inches (38 mm) to the downstream end. The base (24) is secured to the housing at the upstream end and includes a tube (26) for directing airflow and sound waves into the housing. Finally, the acoustic absorption insert (100) is disposed within the housing and includes a web of fibers configured to absorb sound …
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 September 20, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2021.
- 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.