Writing instrument
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United States of America Patent
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-
Feb 15, 1994
Grant Date -
N/A
app pub date -
Nov 16, 1992
filing date -
Nov 16, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A writing instrument has an elongated hollow barrel having a front end formed with a longitudinally extending tip passage centered on and defining an axis, an ink reservoir in the barrel, and a rigid synthetic-resin tip extending along the axis, formed with longitudinal capillaries, and having a front pointed end which projects axially forwardly from the barrel and a rear pointed end which is in the reservoir. This tip is centrally formed with a radially outwardly open groove having axially spaced front and rear flanks and is substantially symmetrical about a plane bisecting the groove. A plurality of radially inwardly projecting holding ribs formed in the passage radially engage the tip and each form a forwardly directed shoulder bearing axially forward on the front flank of the groove.
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