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US 10,994,568 B2Granted
Pressure difference compensation membrane
AssigneeSociete BIC
InventorsAnne-Lise Damiano, Olivier Albenge, Christelle Debrauwer
Life of this patent
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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.
Claims11
A pen comprising:
- a barrel forming a reservoir and a compensation membrane;
- the barrel having a writing tip disposed at a first axial end of the barrel and the compensation membrane disposed at an opposing second axial end of the barrel;
- the compensation membrane including a first portion having a first rigidity and a second portion having a second rigidity that is greater than the first rigidity where the first portion deforms when an inside pressure of the reservoir increases or an outside pressure of the reservoir decreases while the second portion retains its shape and the second portion deforms upon the inside pressure of the reservoir increasing or the outside pressure of the reservoir decreasing an additional amount.
Dependencies are inferred from the claim text.