Method for producing a tube of glassy material, especially quartz glass
CA 2320358 A1 · Owner: Gansicke, Frank · Inventors: Humbach, Oliver; Bogdahn, Thomas; Hain, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
According to a prior method for producing a tube of glassy material especially quartz glass, a hollow cylindrical tube rounds of glassy material is fed in an essentially vertical manner to a heating zone where said tube , rounds is heated and drawn off downwards to the tube without using tools and by producing a transition area from the tube rounds to the tube. The diameter and the wall thickness of the tube are continually measured and the measured geometrical data of the tube are used for generating a control signal by means of which a pressure difference between the pressure P1 in the inner chamber of the tube rounds, the transition area and the tube and the pressure P2 in the …
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 December 6, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 6, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 2021.
- 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.