Automatic cleaning device
CA 1266158 C · Owner: Trenary, John M. · Inventors: Crawford, Alan D.; Trenary, John M.; Johnson, Allan B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Automatic Cleaning Device, Abstract, A periodontal cleaning device including a hollow housing having a handle member and a brush head member. The brush head includes a gear train reciprocally driven by a rack. The gear train includes at least one drive gear engageable by the rack which in turn drives a plurality of series interconnected driven gears. The drive gear includes one portion engaged by the rack and another portion engaged by an adjacent driven gear. An axial width of a gear portion of the drive gear is greater than the axial width of gear portions of the driven gears so that in operation, the rack does not engage the driven gears. The drive and driven gears each include a tuft …
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
- Granted February 27, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 27, 2007.
- 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.