Ball point pen back end closure

Details Ball point pen back end closure Ball point pen back end closure

1976-07-21

1978-08-22

Pellegrino, Stephen C.

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

B43K 702

Patent

active

041085590

ABSTRACT:
A pen plug particularly useful in ballpoint pens as a stopper to prevent back leakage of ink from the ink reservoir of such pens and yet function to allow passage of air into the pen interior. Such plugs include a plurality of substantially continuous synthetic filaments such as cellulose acetate, natural fibrous threads and synthetic filaments or mixtures of differing synthetic filaments bundled, braided and preferably encased in a plastic sheath.

REFERENCES:
patent: 3698825 (1972-10-01), Sears et al.
patent: 3822949 (1974-07-01), Dick

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