Composition for the preparation of pencil lead
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United States of America Patent
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-
Jun 2, 1992
Issued Date -
N/A
app pub date -
Nov 21, 1990
filing date -
Oct 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and composition are disclosed for the preparation of pencil lead from clay, graphite and optionally other material, wherein the clay or the clay/graphite mixture is digested with water, pressed, dried and fired, and at least one alkali phosphate, alkali borate and/or alkali carbonate is added before or as part of the digestion of the clay or the clay/graphite mixture.
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Cited Art Landscape
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