Toothbrush and method of making the same
CA 2256228 A1 · Owner: Trojanowski, Alan G. · Inventors: Trojanowski, Alan G.; Prospero, Richard M.; Kirkup, Ruby E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a toothbrush that provides good subgingival access while being gentle and non-irritating to the oral soft tissue. The toothbrush of the invention comprises a brush heat and a handle. The brush head comprises tufts ofbristles generally parallel to each other and arranged in rows. The rows of bristles comprise outer rows adjacent the periphery of the brush head and at least one inner row between the outer rows. The inner bristles are preferably polished on their free ends and the outer bristles are featheret. The outer bristles are preferably polished prior to being featheret. The inner bristles are preferably shorter than the outer bristles.
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 14, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 2020.
- 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.