Aqueous correction fluids
CA 2194449 C · Owner: The Gillette Company · Inventors: Sanborn, Norman G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Correction fluids are provided which include a cationic stain blocking agent an opacifying pigment and water. Preferred opacifying pigments include an alumina treated titanium dioxide and a clay (Fig. 1). The new correction fluids have improved bleed resistance and hiding power.
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 July 6, 1995 and granted April 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 6, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 2017.
- 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.