Convertible railway-roadway vehicle and method of use
CA 2136552 C · Owner: Larson, Ernest J. Jr. · Inventors: Larson, Ernest J. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for using an over-the-roadway tractor a puller (62) configured for , interconnection to and powered by a tractor (60) for driving the pulley over a railway and railway bogies (24), for , hauling one or more convertible roadway-railway trailers (2) over both a railway and roadway. The method includes configuring the trailer for railway travel and operating the tractor (60) to remove the trailer (2) from the roadway and position the trailer (2) on the railway, driving the tractor (60) onto the puller (62) and connecting the tractor (60) to the pulley (62) drive system, operating the , tractor (60) to connect the puller (62) to the trailer and drive the trailer (2) over the railway …
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 21, 1993 and granted July 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 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.