B - Operations – Transporting – 43 – K
Patent
B - Operations, Transporting
43
K
B43K 5/02 (2006.01) B43K 8/04 (2006.01) B43K 8/06 (2006.01)
Patent
CA 2202713
The writing instrument includes a reservoir for liquid ink, a feed tip opening out in the reservoir, and a buffer reservoir suitable for absorbing the surplus ink in the event that the pressure in the reservoir varies and for subsequently returning it, and implemented in the form of a compact block made of an open-pore material based on microbeads. According to the invention, the buffer reservoir is made up of microbeads that are hydrophobic relative to said ink and a small proportion of microbeads that are hydrophilic relative to said ink, the mixture being either uniform throughout the entire volume of the buffer reservoir, or non-uniform with the proportion of hydrophilic microbeads being smaller in the zone immediately in contact with the surplus ink and being larger in the zone furthest away therefrom. The proportion of hydrophilic microbeads preferably lies in the range 2% to 10% relative to the total weight of the buffer reservoir.
Bedhome Vincent
Duez Jose
Conte Sa
Sim & Mcburney
LandOfFree
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