Ballpoint pen

Details Ballpoint pen Ballpoint pen

2006-08-01

2006-08-01

Walczak, David J. (Department: 3751)

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

C401S216000

Reexamination Certificate

active

07083352

ABSTRACT:
An ballpoint pen has: a tip body made of metal having an front edge part and a plurality of inward protrusions; a ball rotatably embraced between the front edge part and the inward protrusions; and a rod part urging the ball forwardly and bringing the ball into close contact with the inner surface of the front edge part, wherein ink outflow gaps are formed each between the adjacent inward protrusions, the rod part is inserted into the central part of the ink outflow gaps, the diameter of a virtual inscribed circle of the central part of the ink outflow gaps is larger than the outside diameter of the rod part, and a minimum dimension of each the ink outflow gap is smaller than the outside diameter of the rod part.

REFERENCES:
patent: 5000605 (1991-03-01), Schneider
patent: 6193429 (2001-02-01), Kim
patent: 6220774 (2001-04-01), Fukushima
patent: 27 43 888 (1977-09-01), None
patent: 35 02 088 (1985-01-01), None
patent: 2 065 565 (1981-07-01), None
patent: 2 067 475 (1981-07-01), None
patent: 57-193578 (1956-06-01), None
patent: 09-220513 (1997-08-01), None
patent: 2577544 (1998-05-01), None
patent: 2002-254878 (2002-09-01), None
patent: 2003-103980 (2003-04-01), None

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