Appeal No. 1998-2484 Page 8
Application No. 08/212,819
holes. Therefore, as shown in Fig. 3, a ring of liquid
gasket is formed outside the O ring, preventing water
from entering the flange, which in turn prevents the
corrosion of
the flange. The air-tight sealing is examined prior to
filling the liquid gasket, so this examination becomes
more reliable.
The removed bolt can be inserted and tightened
after filling the liquid gasket. If the hole 9 is
used, the hole is plugged. If the liquid gasket
material is a rubber vulcanized at a normal
temperature, it will be cured in a few days after having
been filled, so the plugging will not be necessary. Groove
8 may be made in both flanges 4 and 8, and the same
effect will
be produced by it.
Fig. 4 shows a variant form of the present
invention. When insulating spacer 12 is installed between
the flanges, the width of the groove 8 is made
larger than
the diameter of the buried metal element 13 to prevent
the corrosion of buried metal element 13 by making the
front face of the buried metal element tightly contact
with the liquid gasket 6. In the embodiment example of
Fig. 4, the corrosion of the buried metal element is
prevented as well as that of the flange.
Notwithstanding the appellants statement to the contrary
(brief, page 7), that JP’313 does not disclose a liquid
packing, we note that appellants’ specification (page 1), in a
description of JP’313 sets forth
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