Method for producing porous glass base material
US9731993B2 · kind B2 · utility
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2Claims
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Key dates
| Filing date | Apr 5, 2016 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Apr 5, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2207/70
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a device for producing a large-sized porous base material by a VAD process, the cracking and variation of the outer diameter of the base material are suppressed by forming a smooth tapered part, without changing the length of a non-effective part. In producing the porous base material by a VAD process, the time for a gas to reach a flow amount of the gas in a steady state from starting of the deposition is extended more in a burner that deposits glass microparticles on a layer closer to the outside of the base material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.