PRESSURE DIFFERENCE COMPENSATION MEMBRANE
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United States of America Patent
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Issued Date -
May 23, 2019
app pub date -
Oct 22, 2015
filing date -
Oct 22, 2015
priority date (Note) -
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Abstract
A compensation membrane for compensating a pressure difference between the outside and the inside of a free ink reservoir of a pen or the equivalent, the membrane comprising a first portion having a first rigidity, and a second portion having a second rigidity, the first rigidity being less than the second rigidity. A pen or the equivalent comprising a free ink reservoir provided with such a compensation membrane.
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