Silica polymorph and process for preparaing same
CA 1093278 A · Owner: Union Carbide Corporation · Inventors: Flanigen, Edith M.; Patton, Robert L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Large crystals of a silica polymorph having a characteristic x-ray diffraction pattern a specific, gravity of 1.70 ? 0.05 g/cc.and a mean refractive index of 1.39 ? 0.01 after calcination in air at 600°C. are prepared by a hydrothermal process in which fluoride anions are included in the reaction mixture. The crystals, which can be as large as 200 microns, exhibit a substantial absence of infrared adsorption in the hydroxyl-stretching region and also exhibit an exceptional degree of hydrophobicity. S P E C I F I C A T I O N _ _ _ _ _ _ _ _ _ _ _ _ _
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
- Granted January 13, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 13, 1998.
- 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.