Buffer reservoir for a liquid-ink writing instrument, and a writ

Details Buffer reservoir for a liquid-ink writing instrument, and a writ Buffer reservoir for a liquid-ink writing instrument, and a writ

1997-04-14

1999-07-27

Bratlie, Steven A.

Coating implements with material supply

Material flows through porous tool

Wick feed from within reservoir to tool

401198, B43K 806

Patent

active

059278854

ABSTRACT:
A buffer reservoir suitable for absorbing surplus ink and a writing instrument including the buffer reservoir are provided. The buffer reservoir includes a mixture of microbeads that are hydrophobic relative to the ink and microbeads that are hydrophilic relative to the ink. The mixture of microbeads may either be uniform throughout the entire volume of the buffer reservoir, or non-uniform throughout the entire volume of the buffer reservoir, with the proportion of hydrophilic microbeads to hydrophobic microbeads being smaller in the zone immediately in contact with the feed tip and larger in the zone farthest away from the feed tip. Preferably, the proportion of hydrophilic microbeads is in the range of about 2% to about 10%, by weight, relative to the total weight of the buffer reservoir. The writing instrument includes a reservoir for liquid ink, a feed tip opening out into the reservoir, and a buffer reservoir.

REFERENCES:
patent: 3501225 (1970-03-01), Martin et al.
patent: 5290116 (1994-03-01), Chang
French Search Report from French application No. 9605344, filed Apr. 23, 1996.
Patent Abstracts of Japan vol. 015, No. 164 (M-1106), Apr. 24, 1991 & JP 03 032896 A Feb. 13.

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