Seal with expandable graphite

Details Seal with expandable graphite Seal with expandable graphite

2011-05-03

2011-05-03

Speer, Timothy M (Department: 1784)

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

C428S921000, C523S179000

Reexamination Certificate

active

07935420

ABSTRACT:
Seal, particularly for use with a ladle shroud in the casting of molten metal from a ladle, having an intumescent composition containing expandable graphite from which some, but not all, of interstitial water present therein has been removed. The interstitial water can be driven off from known expandable graphite by heating it to between approximately 230° C. and 280° C. for approximately 30 minutes. Once part of its interstitial water has been removed, the expandable graphite is used to produce the intumescent composition, which is then formed/shaped into the required seal.

REFERENCES:
patent: 4400433 (1983-08-01), Ishiguro et al.
patent: 4945015 (1990-07-01), Milner et al.
patent: RE36206 (1999-05-01), Borneby
patent: 6153668 (2000-11-01), Gestner et al.
patent: 2001-286995 (2001-10-01), None
patent: WO 02/083344 (2002-10-01), None
Eikoh Patent Office; Notification of Reason for Rejection; Application No. 2008-507144, Dispatch Date Apr. 13, 2010.

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