Indicating chart pen cartridge with transparent wall

Details Indicating chart pen cartridge with transparent wall Indicating chart pen cartridge with transparent wall

1987-11-06

1991-07-23

Bratlie, Steven A.

Coating implements with material supply

Transparent or translucent wall

346140A, 401199, 401194, B43K 802, B43K 806

Patent

active

050338960

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.

REFERENCES:
patent: 2678633 (1954-05-01), Holden et al.
patent: 3934255 (1976-01-01), Taylor
patent: 4100549 (1978-07-01), Hubbard

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