Methods of and apparatus for heating a glass tube
CA 1159637 A · Owner: Western Electric Company, Incorporated · Inventors: Lynch, Brian; Partus, Fred P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, In order to react gases and/or vapors to deposit optically suitable layers of doped silicon dioxide on an inner wall of a glass substrate tube (31) to produce a preform from which optical fibers are drawn the glass tube is heated by a mixture of combustible gases. The combustible gases are directed along passageways (70) in a housing (51) of a torch assembly (50) which confines a portion of the length of the tube and then out of the passageways to produce a flame that engages the confined portion of the length of the tube. The housing and walls that define ends of the passageways adjacent the tube are cooled to an extent which substantially eliminates oxidation …
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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 January 3, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 3, 2001.
- 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.