Patents Assigned to The Pilot Ink Co., Ltd.
  • Thermochromic acrylic synthetic fiber, its processed article, and process for producing thermochromic acrylic synthetic fiber
    Patent number: 6444313
    Abstract: A thermochromic acrylic synthetic fiber comprising an acrylonitrile polymer in which a thermochromic pigment composition with an average particle diameter of from 0.5 &mgr;m to 30 &mgr;m is dispersedly contained in an amount of from 0.5% by weight to 40% by weight based on the weight of the polymer, and being made into fibers; the pigment composition containing (a) an electron-donating color-developing organic compound, (b) an electron-accepting compound and (c) a reaction medium that determines the temperature at which the color-developing reaction of the both compounds takes place. Also disclosed are a processed article of the above thermochromic acrylic synthetic fiber, and a process for producing the thermochromic acrylic synthetic fiber.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: September 3, 2002
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Yoshiaki Ono, Naoya Ishimura, Yutaka Shibahashi
  • Color-change laminates and toy sets with the use thereof
    Patent number: 6416853
    Abstract: A color-change laminate comprising a substrate and formed thereon a porous layer which comprises a low-refractive-index pigment dispersed in a binder resin and tenaciously adherent thereto is disclosed. The porous layer becomes transparent or translucent upon absorption of a liquid medium, e.g., water to give a variety of visual changes. The low-refractive-index pigment contains at least a finely particulate silicic acid produced by the wet process. Toy sets consisting of the above color-change laminates with dolls or toy animals and toy sets consisting of the above color-change laminates with a means of water adhesion are also provided.
    Type: Grant
    Filed: January 7, 1999
    Date of Patent: July 9, 2002
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Akio Nakashima, Masahiro Ito, Yoshiaki Ono
  • Reversibly thermochromic light-shielding/light-transmitting laminate member
    Publication number: 20020066890
    Abstract: A reversibly thermochromic light-shielding/light-transmitting laminate member. More particularly, the invention relates to a reversibly thermochromic light-shielding/light-transmitting laminate member which changes not only in color but in transmittance with temperature.
    Type: Application
    Filed: December 3, 2001
    Publication date: June 6, 2002
    Applicant: THE PILOT INK CO., LTD.
    Inventors: Kuniyuki Senga, Jun Sugai, Shigehiro Koide
  • Reversibly thermochromic light-transmitting laminate member
    Publication number: 20020068166
    Abstract: A reversibly thermochromic light-transmitting laminate member which has a satisfactory thermochromic function and undergoes alternate color changes between a colorless transparent state and a colored transparent state.
    Type: Application
    Filed: December 3, 2001
    Publication date: June 6, 2002
    Applicant: THE PILOT INK CO., LTD.
    Inventors: Kuniyuki Senga, Jun Sugai, Shigehiro Koide
  • Reversible thermochromic composition having improved light-fastness and product comprising same
    Publication number: 20020063244
    Abstract: A reversible thermochromic composition which can be freely adjusted in its discoloration temperature even if the kind of electron donating compound and electron accepting compound to be used in combination remain the same and exhibits a remarkably improved light-fastness during quenching.
    Type: Application
    Filed: August 8, 2001
    Publication date: May 30, 2002
    Applicant: THE PILOT INK CO., LTD.
    Inventors: Akio Nakashima, Yoshiaki Ono
  • Ballpoint pen tip and ballpoint pen using the same
    Patent number: 6341914
    Abstract: A ballpoint pen tip 1 and also a ballpoint pen 7 or 8 using the same. A ballpoint pen tip 1, according to the invention, rotatably holds a ball 5 at its front end portion. The ball 5 is held by a plurality of inwardly projecting portions 3 (as a ball receiving seat) and a front end edge portion 4. The projecting portion 3 are formed by inwardly pressing and deforming a neighborhood of a front end portion of a metallic pipe body 2. The front end edge portion 4 is formed by inwardly pressing and deforming the front end portion of the pipe body 2. In the ballpoint pen tip according to the present invention, a relation of A/T>5.8 is satisfied, where A is an outer diameter of the ball 5 and T is a thickness of the pipe body 2.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: January 29, 2002
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Hiroyasu Abe, Masahisa Maki
  • Direct-fluid-supply writing device
    Patent number: 6336762
    Abstract: An ink occuluding member made of a porous material is disposed between a pen point and an ink tank. A partition wall is disposed between the ink occuluding member and the ink tank. The partition wall extends in the lengthwise direction. A first communication hole connected to the front portion of the ink occuluding member provided with the pen point is formed in the front portion of the partition wall. A second communication hole connected to the rear portion of the ink occuluding member is formed in the rear portion of the partition wall.
    Type: Grant
    Filed: February 15, 2000
    Date of Patent: January 8, 2002
    Assignee: The Pilot Ink Co., Ltd.
    Inventor: Shigeru Oike
  • Water-based ball-point pen ink composition
    Patent number: 6261352
    Abstract: Disclosed is a water-based ball-point pen ink composition which gives a smooth writing touch and shows various satisfactory writing performance, comprising a colorant, water, and as an agent for imparting shear-thinning properties at least one member selected from sulfosuccinates represented by the following general formula (1): wherein each R represents an alkyl or alkenyl group having 7 to 18 carbon atoms and X represents an alkali metal or an amine, the content of the at least one member being from 5 to 50% by weight.
    Type: Grant
    Filed: June 9, 1999
    Date of Patent: July 17, 2001
    Assignee: The Pilot Ink Co., Ltd.
    Inventor: Hideaki Asami
  • Writing implement
    Patent number: 6244775
    Abstract: The writing implement 1 comprises a shaft barrel 4 and a tail plug 2. The shaft barrel 4 includes an ink storing body 7 stored in an interior portion thereof and a pen point 8 mounted on a front end portion thereof. The tail plug 2 is removably mounted on an opening formed at the rear end of the shaft barrel 4. The tail plug 2 includes a flange portion 21 which is provided backwardly of the rear end portion of the shaft barrel 4. Between the front surface of the flange portion 21 and the rear end portion of the shaft barrel 4, there is formed a groove 5 for forcibly opening. The groove 5 is formed more deeply inwardly in the diameter direction of the shaft barrel 4 than the inner surface of the rear end opening of the shaft barrel 4.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: June 12, 2001
    Assignee: The Pilot Ink Co., Ltd.
    Inventor: Shigeru Oike
  • Color-change materials
    Patent number: 6228804
    Abstract: A color-change material has a reversibly thermochromic layer and a porous layer containing a low-refractive-index pigment. The color-change material changes its color in response to heat or water. The reversibly thermochromic layer and the porous layer are superposed on each other, or the reversibly thermochromic layer and the porous layer are formed side by side. Alternatively, a color-change material has a substrate and formed thereon a color-changing porous layer including a reversibly thermochromic material, a low-refractive-index pigment, and a binder. The reversibly thermochromic material and the pigment are dispersed in the binder and tenaciously adherent thereto.
    Type: Grant
    Filed: November 2, 1998
    Date of Patent: May 8, 2001
    Assignee: The Pilot Ink Co., Ltd.
    Inventor: Akio Nakashima
  • Ink follower composition for ballpoint pen and ballpoint pen using the same
    Patent number: 6200053
    Abstract: An ink follower composition for ballpoint pens which comprises (1) a hardly volatile liquid and (2) expansible synthetic mica having a quaternary ammonium ion introduced therein or an ink follower composition for ballpoint pens which comprises (1) a hardly volatile liquid, (3) synthetic mica, and (4) a thickener, and a ballpoint pen having the ink follower composition. The ink follower composition follows ink without leaving ink behind on the inner wall of an ink container.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: March 13, 2001
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Hideaki Asami, Toshiji Yokotani
  • Core/sheath type temperature-sensitive shape-transformable composite filaments
    Patent number: 6159598
    Abstract: In a core/sheath type temperature-sensitive shape-transformable composite filament comprising a thermoplastic resin (A) and a thermoplastic polymer (B) having a glass transition temperature within the range of from 0.degree. C. to 70.degree. C., the composite filament is constituted in proportions satisfying the following expressions (1), (2) and (3).In the core;(A)/(B)=5/95 to 90/10 (% by weight) (1)In the sheath;(A)/(B)=100/0 to 50/50 (% by weight) (2)Core/sheath=10/90 to 95/5 (% by weight) (3)The filament is useful as doll hair the hair style of which is thermally shape-transformable to any desired shapes even by infants, and is easily fixable to the transformed shape by cooling.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: December 12, 2000
    Assignee: The Pilot Ink Co., Ltd.
    Inventor: Naoya Ishimura
  • Ballpoint pen and cap therefor
    Patent number: 6076987
    Abstract: The present invention provides the ballpoint pen that precludes the possibility of the pipe portion bending at the joint thereof can be provided even if the outer diameter D is small. In the ballpoint pen having a ballpoint pen tip at a front end thereof, the ballpoint pen tip rotatably accommodating a ball at a front end of a pipe made of metal, an outwardly projecting pipe portion having a uniform thickness throughout the length thereof is arranged at a front end of the ballpoint pen tip, and if a length of the pipe portion is L, an outer diameter of the pipe portion is D, a relational expression "L/D.ltoreq.4.0" is satisfied.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: June 20, 2000
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Nobuo Sekine, Takehiko Yokosuka, Masashi Andoh, Yoshiaki Okawara
  • Reversible thermochromic composition
    Patent number: 6048387
    Abstract: A reversible thermochromic composition is provided which contains a specified diazarhodamine lactone derivative as an electron-donating color-developing organic compound, an electron-accepting compound, and a reaction medium for causing an electron exchange reaction between the components and reversibly at a specified temperature range. This reversible thermochromic composition develops clear reddish color at a colored state, and becomes colorless at a decolored state without residual color.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: April 11, 2000
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Yutaka Shibahashi, Jun Sugai
  • Ink follower composition for ballpoint pen and ballpoint pen using the same
    Patent number: 6012864
    Abstract: An ink follower composition for ballpoint pens which comprises a hardly volatile liquid and aluminum silicate added therein. The ink follower composition for ballpoint pens of the present invention has very little temperature dependence of viscosity, undergoes no liquid separation due to changes in temperature, etc. and therefore follows ink while retaining the interface with the ink and preventing the ink from adhering to the inner wall of the ink tube until the ink runs out.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: January 11, 2000
    Assignee: The Pilot Ink Co., Ltd.
    Inventor: Hideaki Asami
  • Writing implement
    Patent number: 6010269
    Abstract: Ink and a follower advancing with consumption of the ink are stored directly in the inside of a barrel having a pen point at its forward end. An outer tail plug constituted by a closed-end cylinder is fitted to a rear outer surface of the barrel. An air course is formed between the rear outer surface of the barrel and an inner surface of the outer tail plug to communicate with the inside of the barrel through a rear end aperture portion of the barrel. At least one air hole is provided ahead of the rear end aperture portion of the barrel to make the air course communicate with the outside air.
    Type: Grant
    Filed: October 15, 1998
    Date of Patent: January 4, 2000
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Takehiko Yokosuka, Takao Inaba, Hideyuki Tanaka
  • Ball-point pen
    Patent number: D458305
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: June 4, 2002
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Kazuo Iwase, Masayuki Tsuchida, Nana Matsumoto
  • Ball-point pen
    Patent number: D462386
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: September 3, 2002
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Kazuo Iwase, Masayuki Tsuchida, Nana Matsumoto
  • Ball-point pen
    Patent number: D426263
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: June 6, 2000
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Nobuo Sekine, Kazuo Iwase, Mikiya Ido
  • Ball-point pen
    Patent number: D426573
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: June 13, 2000
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Nobuo Sekine, Kazuo Iwase, Mikiya Ido