Polytetrafluoroethylene therapeutic articles
CA 2027684 A1 · Owner: Curtis, John P. · Inventors: Curtis, John P.; Kemp, James H.; Blackwell, Bernie L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polytetrafluoroethylene surfaced articles can be coated with various adjuvants such as medicants and flavorants. The coated articles can be dental flosses, toothpicks, and tongue depressors. The dental flosses can be of a monofilament or a multi-filament type. Further they can be a, filament of polytetrafluoroethylene or have a coating of polytetrafluoroethylene.
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 15, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 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.