Marking instrument
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 21, 1999
Grant Date -
N/A
app pub date -
Jan 28, 1998
filing date -
Jun 30, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A marking instrument, especially a reservoir pen, has a diaphragm which is deflected by retraction of a marking tip to open a port to connect a feed channel to the reservoir containing a marking fluid. A cavity communicating with the port has a volume which reduces when the diaphragm deflects to open the valve and increases when the diaphragm moves to close the valve. The diaphragm has an integral forwardly extending skirt which seals against the feed member at the forward end of the skirt. These features are effective in preventing marking liquid flowing to the tip when not required and leakage of marking fluid between the diaphragm and feed member.
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