Decta
CA 2000334 A1 · Owner: Kowalchuk, Dennis M. · Inventors: Kowalchuk, Dennis M.; Kowalchuk, Dennis M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for aligning electronically or electrically the clutch gears of a hoist and or a drive system, it is known to be mounted on the clutch and sense the teeth of the gears using photo-electric cells and or the use of ultrasound. The photo-optic cells or ultra-sonic transducers are aligned to sense the beginning and the end of the teeth on the drum wheel. In this invention an electronic tone or signal is transmitted from the control box which is also mounted on the clutch arm. The transmission is received by a separate receiver usually located in an area in which it can be heard by the hoistman or the operator. On the receiver unit it also has a tone indicator which is a light that will …
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 October 10, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2011.
- 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.