Electric overhead trolley system
CA 2010459 C · Owner: Fredenhagen Gmbh & Co. Kg · Inventors: Knuettel, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention proposes an electric overhead trolley system in which a travelling gear (14) is provided with a motordriven driving wheel (16) and at least one auxiliary wheel (30) interacting with an auxiliary track (28) at least in, certain sections, which auxiliary wheel contributes in transmitting the drive force to a track (10) so that ascending and descending track portions can be run through with less problems.
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 February 20, 1990 and granted November 29, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 2012.
- 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.