Variable speed drive system
CA 2095663 A1 · Owner: Hoffco, Inc. · Inventors: Lohr, Thomas H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A variable speed drive system for use with a self-propelled device is coupled by a belt to an engine which is mounted to the device. The variable speed drive system includes a variable pitch pulley held in spacedapart relation to the drive shaft by a fixture and rotates about the drive shaft between a first position proximal to the engine and a second position distal to the engine. In the first position, the drive system is disengaged from the engine and the speed of the selfpropelled device is zero, the belt being slack and providing no drive force to the drive system. In the second position, the drive system is moved a maximum amount about the drive shaft and is …
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 6, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 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.