Indicating chart pen cartridge with transparent wall
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United States of America Patent
Stats
-
Jul 23, 1991
Grant Date -
N/A
app pub date -
Nov 6, 1987
filing date -
Nov 6, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cartridge consisting of a hollow casing of molded plastic substance and an ink-retention sponge disposed in the casing, together with a stylus carried by the casing, for producing ink lines on a chart, from the ink content of the casing and contained retention sponge. A wall of the casing is transparent to enable the retention sponge therein and the ink carried thereby to be viewed by a user from the exterior of the casing. The intensity of the observed ink color is an indication as to the amount of ink remaining in the casing and sponge.
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Cited Art Landscape
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