Coating composition comprising colloidal silica and glossy ink jet recording sheets prepared therefrom
CA 2479692 A1 · Owner: W.R. Grace & Co. -Conn. · Inventors: Michos, Demetrius; Fruge, Daniel Ray
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coating composition comprising low sodium containing colloidal silicas and ink jet recording sheets prepared from such coatings are described. The coating comprises binder and colloidal silica preferably having an average particle size in the range of about 1 to 300 nanometers and which has a solids to alkali metal ratio of at least the sum of AW(-0.013SSA+9) AW being the , atomic weight of alkali metal present in the colloidal silica and SSA being the specific surface area of the silica. It has been discovered that if the alkali metal, e.g. sodium, content of colloidal silica is reduced coatings , prepared from such colloidal silica and applied to conventional ink jet recording …
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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 March 19, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2025.
- 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
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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.