Pen cap with pressure relief means
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United States of America Patent
Stats
-
Nov 2, 1999
Grant Date -
N/A
app pub date -
Aug 19, 1998
filing date -
Aug 19, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pen cap for closing on a ball-point pen to prevent ink leakage, the pen cap including a cap body, a sealing cap covered on the cap body, and a ball valve mounted inside the cap body within the sealing cap and moved between inside ribs in the cap body and inside ribs in the sealing cap. Closing the pen cap on the pen causes excessive air to pass through an air passage formed by gaps among the inside ribs to the outside of the pen cap via an exhaust hole on the sealing cap, and the air passage is closed when the writing tip of the pen is engaged into a tapered hole on one cylindrical rod projecting from the ball valve.
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