Glass manufacturing – Processes – Fining or homogenizing molten glass
Reexamination Certificate
2008-06-03
2008-06-03
Hug, Eric (Department: 1791)
Glass manufacturing
Processes
Fining or homogenizing molten glass
C065S134900, C065S374120, C065S347000, C096S176000, C096S193000
Reexamination Certificate
active
07380416
ABSTRACT:
The present invention provides a A metal conduit for molten glass and a vacuum degassing apparatus are disclosed, which are capable of coping with extension and contraction, and vibration. By disposing at least one convex portion20so to have a height of 4 mm or above in a radial direction and continuously extend in a peripheral direction, it is possible to absorb thermal expansion and contraction without changing the entire length of the metal conduit10and to suppress from the metal conduit10from vibrated even when molten glass121is conveyed by the metal conduit. By employing the metal conduit10stated earlier in an upstream conveying pipe130A, an uprising pipe122U, a vacuum degassing vessel120, a downfalling pipe122L, a downstream conveying pipe130B or the like in a vacuum degassing apparatus30, it is possible to cope with thermal expansion and contraction, and vibration caused when conveying molten glass121.
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Hamashima Kazuo
Hirahara Yasuharu
Obayashi Koji
Tomita Naruaki
Asahi Glass Company Limited
Hug Eric
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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