Stamp formed muffler with multiple low frequency resonating chambers
CA 1278524 C · Owner: Ap Industries, Inc. · Inventors: Rosa, Bruno A.; Kimmet, Mark S.; Harwood, Jon W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A muffler is provided with a pair of internal plates stamp formed to define an array of tubes therebetween. An external shell, which may be stamp formed surrounds and, encloses at least selected portions of the internal plates. The array of tubes stamp formed in the internal plates includes at least two tuning tubes. One tuning tube terminates at a tuning aperture in one of the two internal plates while, the other tuning tube terminates at an aperture stamp formed in the other of the two internal plates. Thus one tuning, tube will communicate with a low frequency resonating chamber on one side of the pair of internal plates while the other, tuning tube will communicate with a low frequency …
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
- Granted January 2, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 2008.
- 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.