Patents Assigned to Kabushiki Kaisha Pilot Corporation
  • Patent number: 11919324
    Abstract: A soft-member attachment structure includes an attachment hole provided through a rear end portion of a barrel. The barrel configures a thermochromic writing instrument, along a longitudinal central axis and having an inner circumferential surface between two openings located at an upper end and a lower end; an attachment portion located under a large diameter portion of a soft member used for a thermochromic change and having a diameter being smaller than a diameter of the large diameter portion and allowing insertion into the attachment hole; a straight internal hole provided along a longitudinal central axis of the soft member and opening at least at a lower end of the soft member; and a rod-like inner core having an outer diameter allowing insertion into the internal hole, a length to be placed within the internal hole, and an outer circumferential surface contacting an inner circumferential surface of the internal hole.
    Type: Grant
    Filed: December 24, 2020
    Date of Patent: March 5, 2024
    Assignee: Kabushiki Kaisha Pilot Corporation
    Inventor: Masaya Yamaguchi
  • Patent number: 11912058
    Abstract: A clip body includes one upper wall extending in a longitudinal direction of a barrel and a pair of side walls formed at least on a front side of the upper wall, projecting from both side portions of the upper wall in a direction of a surface of the barrel, and having inner surfaces facing each other, a holding portion is provided on a back side of the clip body and between the pair of side walls, has a shape capable of producing an elastic force by deformation, and projects more in the direction of the surface of the barrel than the pair of side walls, the surface of the barrel includes a guide groove extending in the longitudinal direction of the barrel and provided with a bottom surface contacting the holding portion and a pair of side surfaces to restrict lateral movement of the holding portion, and a clip base is connected to a rear side of the clip body and supports the clip body at a height not to cause the pair of side walls to contact the surface of the barrel and the holding portion to contact the b
    Type: Grant
    Filed: January 9, 2020
    Date of Patent: February 27, 2024
    Assignee: Kabushiki Kaisha Pilot Corporation
    Inventor: Hisatoshi Hayakawa
  • Publication number: 20230383175
    Abstract: [Problems] To provide a reversibly thermochromic composition having excellent contrast between a colored state and a decolored state, and excellent light resistance, and a reversibly thermochromic microcapsule pigment encapsulating the reversibly thermochromic composition. [Solution] Disclosed is a reversibly thermochromic composition including: (a) an electron-donating color-developing organic compound; (b) a combination of a compound having a specific structure as an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the reversibly thermochromic composition.
    Type: Application
    Filed: September 17, 2021
    Publication date: November 30, 2023
    Applicants: THE PILOT INK CO., LTD., KABUSHIKI KAISHA PILOT CORPORATION (also trading as PILOT CORPORATION)
    Inventors: Hiroshi UMEMOTO, Kaori MAEHASHI, Naoto MASUSHIGE, Yui MORIGAKI
  • Publication number: 20230287259
    Abstract: [Problems] To provided are a reversibly thermochromic composition that shows black during color development by using a fluoran derivative having a specific structure as an electron-donating color-developing organic compound, turns colorless during decoloration, and is excellent in light resistance and a microcapsule pigment encapsulating the reversibly thermochromic composition. [Solution] Disclosed is a reversibly thermochromic composition including: (a) a fluoran derivative having a specific structure as an electron-donating color-developing organic compound; (b) a compound having a specific structure as an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the reversibly thermochromic composition.
    Type: Application
    Filed: September 17, 2021
    Publication date: September 14, 2023
    Applicants: THE PILOT INK CO., LTD., KABUSHIKI KAISHA PILOT CORPORATION (also trading as PILOT CORPORATION)
    Inventors: Hiroshi UMEMOTO, Toshihiro SHIBATA, Tomoo TSUNEKAWA, Yui MORIGAKI
  • Patent number: 11667146
    Abstract: In a writing tool 1, a front shaft 5 is detachably provided on a rear shaft 6 containing an ink absorbent body 7. A filling part 51 is provided on an outside surface of a rear part of the front shaft 5. The filling part 51 detachably fits to a fitted part 61 formed on an inside surface of an opening part of the rear shaft 6. The filling part 51 has an outward-facing pressure contact part 53 and a radially penetrating slit 54. The fitted part 61 has an inward-facing pressure contact part 63. The front shaft 5 and the rear shaft 6 are brought into a pressure contact with each other when the front shaft 5 and the rear shaft 6 are fitted to each other.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: June 6, 2023
    Assignee: KABUSHIKI KAISHA PILOT CORPORATION
    Inventors: Hisatoshi Hayakawa, Tatsuya Iijima, Hisashi Iwata
  • Patent number: 11560490
    Abstract: The present invention provides a water-based ink composition for a ballpoint pen that is less likely to cause bleeding of a written trace in writing, provides a favorable written trace without causing no blurring or line splitting, and excels in the storage stability of the ink composition; and a water-based ballpoint pen using the ink composition. A water-based ink composition for a ballpoint pen comprising water, a coloring agent, a copolymer having a specific structure; and a water-based ballpoint pen using the ink composition.
    Type: Grant
    Filed: October 23, 2018
    Date of Patent: January 24, 2023
    Assignee: KABUSHIKI KAISHA PILOT CORPORATION
    Inventor: Taro Tozuka
  • Publication number: 20220372305
    Abstract: Provided is a water-soluble sheet-like coloring material in which sheets are less likely to stick to each other, have appropriate self-standing property and flexibility, and can be quickly brought into a uniform state when dissolved in water. A water-soluble sheet-like coloring material including a film-forming water-soluble polymer; a dissolution accelerator; a colorant; and a moisture-retaining agent.
    Type: Application
    Filed: December 4, 2019
    Publication date: November 24, 2022
    Applicant: KABUSHIKI KAISHA PILOT CORPORATION (also trading as PILOT CORPORATION)
    Inventor: Takahito MIYAKE
  • Publication number: 20220363926
    Abstract: [Problem] To provide an oil-based ink composition for ballpoint pens and also an oil-based ballpoint pen employing the composition. The ink composition inhibits a ball seat from wearing under high pen pressure (writing load: 300 to 500 gf), improves writing feeling, and is excellent in writing performance at the beginning of handwriting, in temporal stability and in ink followability. [means to solve the problem] An oil-based ink composition for ballpoint pens, comprising a colorant, an organic solvent, and a polyoxy-alkylene glyceryl ether.
    Type: Application
    Filed: October 28, 2020
    Publication date: November 17, 2022
    Applicant: KABUSHIKI KAISHA PILOT CORPORATION (also trading as PILOT CORPORATION)
    Inventors: Takahito MIYAKE, Chinatsu SHINOZAKI
  • Patent number: 11446953
    Abstract: A pressurized writing implement includes a shaft tube capable of housing therein a refill filled with a writing implement ink composition. The pressurized writing implement further includes a pressurizing mechanism that applies a pressure to the writing implement ink composition, the pressurized writing implement being capable of switching a writing state in which a front end part of the refill projects from a front end opening of the shaft tube, and a not-writing state in which the front end part of the refill is retracted from the front end opening of the shaft tube. The pressurized writing implement further includes a pressurizing-force adjusting mechanism that adjusts the pressure.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: September 20, 2022
    Assignee: KABUSHIKI KAISHA PILOT CORPORATION
    Inventors: Nobukazu Seri, Yusuke Sanada
  • Publication number: 20220251406
    Abstract: Provided are a reversibly thermochromic aqueous ink composition having excellent writability and few problems such as aggregation of a colorant, an increase in viscosity of the composition, or a decrease in handwriting density, and a refill or an aqueous ballpoint pen using the reversibly thermochromic aqueous ink composition. A reversibly thermochromic composition is a reversibly thermochromic aqueous ink composition containing a reversibly thermochromic microcapsule pigment encapsulated in a microcapsule formed from an organic resin, an N-vinyl-2-pyrrolidone polymer, glycerin, and water, in which when contents (% by mass) of the reversibly thermochromic microcapsule pigment, the N-vinyl-2-pyrrolidone polymer, and the glycerin with respect to a total mass of the ink composition are PMC, PPVP, and PG, respectively, 0.3?PMC/(PPVP+PG)?4, and 0.2?PPVP/PG?5, and a refill or an aqueous ballpoint pen incorporating the reversibly thermochromic aqueous ink composition.
    Type: Application
    Filed: March 30, 2020
    Publication date: August 11, 2022
    Applicant: KABUSHIKI KAISHA PILOT CORPORATION (also trading as PILOT CORPORATION)
    Inventors: Naoto MASUSHIGE, Mamiko OGURA, Itsuka OHNO
  • Patent number: 11396203
    Abstract: A knock type writing tool is provided, in which an appropriate amount of air can be taken in depending on an amount of a thermochromic ink discharged from a pen tip, so that the thermochromic ink can be smoothly discharged from the pen tip, and in which a writing body can rotate surely in conjunction with a rotation of a rotating member. An air hole 63a and a plurality of projection pieces 63b are provided at a rear end portion of a writing body 6. A front surface of a projection and retraction rotating member 7 is provided with a plurality of abutment parts 73, on which respective rear ends of the plurality of projection pieces 63b are to abut, and with a plurality of protrusion parts 72, each of which is formed between the plurality of abutment parts 73 and protruded more forward than the plurality of abutment parts 73. The protrusion parts 72 are respectively inserted in gaps 63c between the projection pieces 63b.
    Type: Grant
    Filed: October 4, 2019
    Date of Patent: July 26, 2022
    Assignee: KABUSHIKI KAISHA PILOT CORPORATION
    Inventor: Hisatoshi Hayakawa
  • Patent number: 11390111
    Abstract: A writing implement includes: a barrel; a writing body supported by the barrel so as to be relatively movable with respect to the barrel in an axial direction thereof, whereby the writing body is projected from and retracted into a front end of the barrel; a rotation member disposed in the barrel so as to be relatively rotatable with respect to the barrel about an axis thereof, the rotation member being provided with a groove or a slit that helically extends about the axis; and a pressing unit having a moving unit that moves in the groove or the slit, the pressing unit being relatively movable with respect to the barrel in the axial direction, while its relative rotation about the axis being restricted; wherein the pressing unit can be pressed forward with respect to the barrel.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: July 19, 2022
    Assignee: KABUSHIKI KAISHA PILOT CORPORATION
    Inventor: Takashi Iwahara
  • Patent number: 11384247
    Abstract: The present invention provides a thermochromic color-memory composition including (a) an electron-donating color-developing organic compound, (b) an electron-accepting compound, and (c) an ester compound represented by the following formula (1) or (2), as a reaction medium which controls color reaction of the component (a) and the component (b); and a thermochromic color-memory microcapsule pigment encapsulating the thermochromic color-memory composition.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: July 12, 2022
    Assignee: KABUSHIKI KAISHA PILOT CORPORATION
    Inventors: Yoshiaki Ono, Masayuki Mita
  • Patent number: 11383547
    Abstract: A friction body is configured to discolor handwriting written with a thermochromic ink with frictional heat. The friction body includes a viscoelastic body, and has a Shore A hardness (based on JIS K 7215) immediately after start of contact of an indenter point of from 55 to 95.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: July 12, 2022
    Assignee: KABUSHIKI KAISHA PILOT CORPORATION
    Inventor: Kuniyuki Senga
  • Publication number: 20220169919
    Abstract: [Problems] Provided are a highly marketable reversibly thermochromic composition that provides a black color during color development by using a fluoran derivative having a specific structure as an electron-donating color-developing organic compound, turns colorless during decoloration, and is excellent in contrast between a colored state and a decolored state and a microcapsule pigment encapsulating the same. [Solution] Disclosed are a reversibly thermochromic composition including: (a) a fluoran derivative having a specific structure as an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the same.
    Type: Application
    Filed: March 26, 2020
    Publication date: June 2, 2022
    Applicants: THE PILOT INK CO., LTD., KABUSHIKI KAISHA PILOT CORPORATION (also trading as PILOT CORPORATION)
    Inventors: Hiroshi UMEMOTO, Yui MORIGAKI, Naoto MASUSHIGE
  • Patent number: 11267978
    Abstract: To provide a reversibly thermochromic aqueous ink composition excellent in dispersion stability of a reversibly thermochromic microcapsule pigment and a writing instrument using the same. Disclosed is a reversibly thermochromic aqueous ink composition comprising a reversibly thermochromic microcapsule pigment encapsulating a reversibly thermochromic composition comprising (a) an electron-donating color-developing organic compound, (b) an electron-accepting compound, and (c) a reaction medium to determine an occurrence temperature of a coloring reaction of the component (a) and the component (b), and a vehicle comprising water and a specific gravity adjuster selected from the group consisting of an oxyacid belonging to Group 6 having an atomic weight of 90 to 185 or salt thereof.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: March 8, 2022
    Assignees: KABUSHIKI KAISHA PILOT CORPORATION, THE PILOT INK CO., LTD.
    Inventors: Katsuyuki Fujita, Yasuaki Kambe, Masayuki Mita, Tomoyuki Yamamura
  • Patent number: 11267278
    Abstract: The present invention includes a shaft cylinder having an opening at a front end thereof, a tip holder movable in an axial direction of the shaft cylinder, a tip projectable and retractable in conjunction with a movement of the tip holder, an annular member fitted on the tip holder and axially movable, and an elastic member connecting the tip holder and the annular member so that they are movable relatively to each other. A contact surface tapered toward the front end is formed on an outer periphery of the annular member. A cutout reduces an inner diameter of the annular when a load is received by the contact surface. A guide surface is formed on the part of the inside surface of the shaft cylinder. The contact surface receives the load from the guide surface in conjunction with the movement of the tip holder toward the front end side.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: March 8, 2022
    Assignee: Kabushiki Kaisha Pilot Corporation
    Inventor: Yoshihito Kozaki
  • Patent number: 11179963
    Abstract: A thermochromic writing instrument including a writing body, storing a thermochromic ink therein, stored in a barrel; an operation body provided in the barrel to be operated to longitudinally move the writing body; a nib of the writing body configured to be capable of appearing from a front end of the writing instrument, wherein the writing instrument 1 further includes a friction unit, for rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time, and at least one clip body as the operation body, the friction unit 10 is provided at a rear end of the barrel, and the clip body is provided in an area other than the rear end of the barrel.
    Type: Grant
    Filed: October 21, 2019
    Date of Patent: November 23, 2021
    Assignees: THE PILOT INK CO., LTD., KABUSHIKI KAISHA PILOT CORPORATION
    Inventor: Yoshihiro Ito
  • Patent number: D941921
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: January 25, 2022
    Assignee: KABUSHIKI KAISHA PILOT CORPORATION
    Inventor: Akinori Ikeda
  • Patent number: D949970
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: April 26, 2022
    Assignee: KABUSHIKI KAISHA PILOT CORPORATION
    Inventor: Genki Iwao