Ink chamber pressure enhancing control
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 15, 2000
Grant Date -
N/A
app pub date -
Mar 30, 1999
filing date -
Mar 30, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ink chamber pressure enhancing control device, which includes a valve block mounted in the barrel of a writing instrument above an ink chamber, a cap axially movably mounted in the valve block above a valve port in the valve block, the cap having an air inlet, a piston supported on a spring member above the ink chamber in the barrel, wherein the piston is forced upwards by the spring member to close the valve port, enabling an air chamber to be formed within the cap and the valve block above the valve port, and from the air inlet at the cap and the valve port is forced into the ink chamber in the writing instrument when the cap is depressed.
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