Abrasion-resistant lenses and process of making
CA 1105784 A · Owner: American Optical Corporation · Inventors: Laurin, Bernard L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
AO-3163, AHS/sam, 1/21/77, ABRASION-RESISTANT LENSES AND PROCESS OF MAKING Abstract of the Disclosure, Plastic substrates of optical elements having surfaces coated with the abrasion-resistant coating compositions described in U.S. Patent No. 3,986,997 are improved by utilizing a tiecoat comprising an A-alkylenealkoxysilane where A contains a group reactive with reactive with the substrate. For some substrates particularly polycarbonate lenses, the coating process is substantially simplified by reducing criticality of conditions when the tie-coat of the present invention is used then when the process of the aforementioned patent is followed with the tie-coats conventionally used and …
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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
- Granted July 28, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 28, 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.