Inventor
YAMAUCHI OSAMI
JP5 patents
Patents
5 patentsUS4913175AApr 3, 1990
Liquid-applying tip assembly
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US7946777B2May 24, 2011
Multi-refill writing instrument
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US4410290AOct 18, 1983
Composite pen tip
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US4968169ANov 6, 1990
Penpoint assembly and writing instrument employing the same
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US5290117AMar 1, 1994
Penpoint assembly and writing instrument employing the same
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