Ball-point pen

Details Ball-point pen Ball-point pen

2000-09-12

2001-10-09

Walczak, David J. (Department: 3751)

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

C401S209000

Reexamination Certificate

active

06299376

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a ball-point pen.
BACKGROUND OF THE INVENTION
Ball-point pens are well known and widely used as writing tools, and each comprises a writing ball rotationally held in a penpoint tip. An ink filled in an ink reservoir fixed in the ball-point pen will be guided in use to the writing ball so as to be transferred to a paper sheet, or the like, as the ball rotates. Usually employed as a material for forming writing balls in ball-point pens are zirconia, stainless steel or tungsten.
Recently, some types of novel aqueous ink compositions have been proposed, and bright pigments contained therein have been intended to give golden, silver-colored or any other metallic-colored writings. For example, an aluminum pigment containing aqueous ink is disclosed in the Japanese Patent Laying-Open Gazette Hei No. 7-118592. A pearl-glossy pigment containing aqueous ink is disclosed in the Japanese Patent Laying-Open Gazette Hei No. 8-151547. An aqueous metallic-colored ink disclosed in the Japanese Patent Laying-Open Gazette Hei No. 11-29734 comprises an aluminum pigment whose particles are coated with an organic pigment particles by means a fixing agent.
However, it has not necessarily been easy to achieve sufficiently intensive brilliancy and stereoscopic feeling in the writings or membranes formed of such prior art aqueous inks containing the afore-said aluminum pigment or pearl-glossy pigment. Further, a resin material or the like used to fix a colorant (viz., dyestuff molecules or pigment particles) on the described basic pigment to realize a metallic luster has also caused a poor brilliancy.
In view of these problems, the present applicant has already proposed in its Japanese Patent Application No. 11-76868 an improved type of brilliant aqueous ink composition. This composition was characterized by a glass flake pigment that would provide, in addition to brilliancy higher than those given by any known aqueous inks comprising conventional pigments, an intensive stereoscopic feeling that had not been realized by the prior art aqueous inks.
Particle diameter of such a glass flake pigment is comparatively large so that a higher viscosity of ink would possibly cause certain incontinuity in the writings, if the known ordinary writing ball were used.
SUMMARY OF THE INVENTION
It is desirable to provide an improved novel type of ball-point pen that writings can be made generally free from unintentional broken lines, even in use with a brilliant aqueous ink comprising a glass flake pigment.
Such improved ball-point pen may be provided by a ball-point pen comprising
a. a penpoint tip,
b. a writing ball rotationally held in the penpoint tip and
c. an ink reservoir whose distal end is connected to the penpoint tip,
wherein the writing ball is formed of a sintered inorganic material having a surface layer comprising fine holes that have a median diameter of from about 1 to about 20 &mgr;m, and the ink reservoir is filled with an aqueous ink containing a glass flake pigment and having a viscosity of about 4,000 to about 30,000 mPa·S.


REFERENCES:
patent: 3166050 (1965-01-01), Fehling et al.
patent: 4150905 (1979-04-01), Kaplan et al.
patent: 4621936 (1986-11-01), Hansson et al.
patent: 4653950 (1987-03-01), Yoshida

Affiliated with

Also associated with

Rating

Ball-point pen does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ball-point pen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ball-point pen will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2569962