Color-memorizing photochromic writing instrument,...

Details Color-memorizing photochromic writing instrument,... Color-memorizing photochromic writing instrument,...

2005-09-15

2009-08-18

Le, Huyen (Department: 3751)

Coating implements with material supply

Material flows through porous tool

Wick feed from within reservoir to tool

C401S142000

Reexamination Certificate

active

07575386

ABSTRACT:
A color-memorizing photochromic writing instrument, which comprises a writing tip portion connected to a light-shielding tubular member or refill; and a color-memorizing photochromic ink, wherein the ink is prepared by dissolving, dispersing or suspending a diarylethene photochromic compound in a vehicle containing at least a solvent and a binder, wherein the diarylethene photochromic compound is in a coloring state, and a color-memorizing photochromic writing instrument set comprising the writing instrument and a color-changing means.

REFERENCES:
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patent: 2003/0118924 (2003-06-01), Kim et al.
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patent: 102 42 435 (2004-03-01), None
patent: 8-156479 (1996-06-01), None
patent: WO 2004/041961 (2004-05-01), None
Hisataka Nakashima et al., “Synthesis of Polystyrene and Poly(alkyl methacrylate)s Having Photochromic Dithienylethene Pendant Groups” (1998) Polymer Journal, vol. 30, No. 12, pp. 985-989.
Masahiro Irie et al., “Photochromism of Diarylethenes Having Thiophene Oligomers as the Aryl Groups” (1997) Tetrahedron, vol. 53, No. 36, pp. 12263-12271.
European Search Report dated Nov. 15, 2005.

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