Concrete finishing trowel with improved rotor assembly drive system
CA 2312080 A1 · Owner: Wacker Corporation · Inventors: Smith, Peter J.; Sartler, Ronald R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A concrete finishing trowel has one or more driven rotor assemblies coupled to an engine, or other power source of the machine by a novel torque transfer system including at least one, flexible shaft and possibly including a variable speed ratio torque converter assembly. The, flexible shaft, preferably comprising a flexible wound wire shaft bends to , accommodate tilting, movement of the associated rotor assembly that occurs upon a steering operation, thereby, eliminating the need for high-maintenance universal joints or other less , durable equipment. The, torque converter assembly preferably taking the form of a pair of variable speed clutches each, having variable diameter sheaves …
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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 June 21, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 21, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 2022.
- 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.