Mufflers
CA 2094168 C · Owner: Ramjit, Carl N. · Inventors: Ramjit, Carl N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sound attentuating device, typically applied to the exhaust of internal combusion engines, and consisting of a helicoidal element fitted snugly within a tube. The helicoid is formed by a sequence of flat triangular sufaces generated by a forward fold transverse to a longitudinal axis followed by a reverse fold oblique to the longitudinal axis and having the procedure repeated. It is analogous to an accordion-like strip which rotates because an oblique fold alternates with a transverse fold. The muffler functions by having the helicoid reflect sound waves generated within the machine to which it is attached while permitting the escape of gases through the tube in a spiral manner.
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 April 16, 1993 and granted May 6, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 2015.
- 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.