Method of producing optical fiber preform
CA 2357593 A1 · Owner: Ohishi, Toshihiro · Inventors: Ohga, Yuichi; Nakamura, Motonori; Ohishi, Toshihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plurality of glass particles synthesizing burners are arranged at a predetermined burner interval opposite to a rotating starting rod. The starting rod and the glass particles synthesizing burners are relatively parallely reciprocally moved, and the soot deposition is conducted. A reciprocating speed v(mm/minute), axis rotating speed r (rpm) and burner, interval L (mm) are set so that a value A expressed by the expression A = (r/v) x L is in a range 40 ~ A ~ 8.
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 20, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2023.
- 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.