Strippable coating for optical fiber
CA 2132992 C · Owner: Petisce, James Raymond · Inventors: Petisce, James Raymond; Shepherd, Lloyd; Parker, Theodore Lance
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coating system for individual glass fibers 12 of a lightwave communications system has improved strippability particularly in situations where a, group of such fibers are arrayed together in what is known as a ribbon 20. A preferred embodiment includes two layers (primary 14 and secondary 15) of polymeric materials surrounding the glass fiber 12. The primary layer 14 comprises an oligomer (50-80% by weight), a diluent (15-40% by weight) and additives (5-35% by weight). The oligomer comprises polyol "A," diisocyanate "B," and a hydroxy-terminated alkyl acrylate "C" having the structure C-BA-B-C. At least one of the additives contains a non-crosslinked hydrocarbon component (1-20% by …
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 September 27, 1994 and granted October 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 27, 2016.
- 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.