Electronic control for turf maintenance vehicle
CA 2126868 C · Owner: Lonn, Dana R. · Inventors: Wucherpfennig, Fredrick D.; Dunford, William M.; Lonn, Dana R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides for an automated clip control device for maintaining a predetermined clip at varying ground speeds, heights of cut, and other changed conditions. The reel speed of the mower (10) is controlled based upon a feed-back control loop, using as input the ground speed of the mower (10) the actual speed of the reel (48, 50, and 52) the number of, blades on the reel, and height of cut among other factors. A microprocessor (102) uses control process equations to determine the duration of an output pulse width modulated signal which is provided to a valve (702 706) controlling hydraulic fluid flow to the reel motor (71-75). The target value of the reel speed 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 December 17, 1992 and granted December 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2014.
- 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.