Device for preventing drying of ink in writing instrument
AssigneeSakura Color Products Corporation
InventorsShigeyasu Inoue, Tatsuya Ozu, Hiroyoshi Yamamoto
Life of this patent
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Abstract
A device for preventing drying of ink in a writing instrument, in particular, a writing instrument provided with a tubular holder made of synthetic resin. The writing instrument is internally provided with a tubular ink-cartridge containing ink and a liquid retainer impregnated with liquid whose vapor pressure is higher than that of the liquid in the ink in the ink-cartridge, provided in an inner space of the holder so as to control evaporation of ink from the cartridge by the use of vapor evaporating from the impregnated retainer.
Claims7
A writing instrument comprising:
- a pen point;
- a tubular holder having peripheral walls;
- an ink-cartridge containing ink having a first liquid therein, in fluid communication at one end thereof with said pen point disposed within said holder and spaced from said walls so as to define a closed space between said walls and said cartridge surrounding said ink-cartridge;
- a backflow preventing substance filling another end of said ink-cartridge opposite said one end so as to block fluid communication between said space and said ink in said ink-cartridge through said another end;
- a liquid retainer, said retainer being impregnated with a second liquid whose vapor pressure is higher than that of said first liquid in said ink-cartridge and being disposed in, and occupying a portion less than all of, said space, whereby vapor of said second liquid evaporated from said retainer fills said closed space so as to prevent evaporation of said first liquid from said ink;
- a cap removably covering said pen point;
- and
- an elastic sealing member in said cap removably covering said pen point so as to prevent said first liquid from evaporating from said pen point.
A writing instrument comprising:
- a pen point;
- a tubular holder having peripheral walls;
- an ink-cartridge containing ink having a first liquid therein, in fluid communication with said pen point disposed within said holder and spaced from said walls so as to define a closed space between said walls and said cartridge surrounding said cartridge;
- a liquid retainer, said retainer being impregnated with a second liquid whose vapor pressure is higher than that of said first liquid in said ink-cartridge and being disposed in, and occupying a portion less than all of, said space, whereby vapor of said second liquid evaporated from said retainer fills said closed space so as to prevent evaporation of said first liquid from said ink, and a cap removably covering said pen point, said space communicating with the interior of said cap through an opening in said holder adjacent to said pen point that said vapor fills said interior of said cap.
Dependencies are inferred from the claim text.