Rotary toothbrush
CA 2078330 C · Owner: Roecker, David W. · Inventors: Roecker, David W.; Hegemann, Kenneth J.; Gebhard, Albert William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A powered toothbrush is provided with a pair of disc-like rotary brushes (9) mounted for rotation about an axis (28) generally perpendicular to the length of the brush. The rotary brushes (9) are in axially spaced relationship and are provided with inwardly directed bristles (92). Between the rotary brushes upper and lower brushes (6, 8) are mounted above and below the axis of rotation for linear reciprocating motion generally perpendicular to that axis. The upper brush (8) has upwardly directed bristles (80), and the linear brushes (6, 8) are mounted to the rotary brushes (9) so as to be brought into reciprocal. Linear movement when the rotary brushes are reciprocated angularly. Reciprocal …
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 18, 1990 and granted February 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2012.
- 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.