PRESSURE DIFFERENCE COMPENSATION MEMBRANE
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United States of America
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Issued Date -
Mar 26, 2020
app pub date -
Nov 26, 2019
filing date -
Nov 26, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
A compensation membrane and a pen or the equivalent including a compensation membrane. The compensation membrane being configured for compensating a pressure difference between the outside and the inside of a free ink reservoir of a pen or the equivalent. The membrane including a first portion having a first rigidity and a second portion having a second rigidity, the first rigidity being less than the second rigidity.
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