Burner for manufacturing porous glass base material

Details Burner for manufacturing porous glass base material Burner for manufacturing porous glass base material

2010-08-24

2011-12-20

Daniels, Matthew (Department: 1741)

Glass manufacturing

Fiber making apparatus

Having coating or treating means

C065S414000, C065S421000

Reexamination Certificate

active

08079233

ABSTRACT:
The present invention provides a burner for manufacturing a porous glass base material that has small-diameter gas discharge ports and that achieves uniform linear velocity at the gas discharge ports, a uniform reaction, and a stable flame, and improved deposition efficiency. In the burner for manufacturing a porous glass base material, inner diameters of the pipes forming the gas discharge ports positioned farther inward in a radial direction than the gas discharge ports in which the small-diameter gas discharge port nozzles are arranged contract beginning from a position farther on a burner source side than the prescribed length L position, the contraction being greater closer to a burner tip side, and inner diameters of the pipes forming the gas discharge port in which the small-diameter gas discharge port nozzles are arranged and the gas discharge ports that are positioned farther outward in the radial direction than this gas discharge port contract beginning from a position farther on a burner tip side than the prescribed length L position, the contraction being greater closer to a burner tip side.

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Machine Translation of JP2004-036910, performed Aug. 18, 2011.
Written Opinion (PCT/ISA/237) issued in PCT/JP2009/000884 (parent application) mailed in Apr. 2009.
International Search Report (ISR) issued in PCT/JP2009/000884 (parent application) for Examiner consideration, citing Foreign Patent document Nos. 13-16 listed above.
Written Opinion (PCT/ISA/237) issued in PCT/JP2009/000884 (parent application). Concise Explanation of Relevance: This Written Opinion considers the claims are described by or obvious over the references Nos. 13-14 cited in ISR above.

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