Patents by Inventor Kei Saito

Kei Saito has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20250244695
    Abstract: A developing device includes a developing roller, a developer supply rotator, and a removable sheet-shaped member. The developing roller bears developer and develops a latent image on a surface of an image bearer. The developer supply rotator is disposed opposite the developing roller to rotate in a specified direction to supply the developer to the developing roller. The removable sheet-shaped member separates the developing roller and the developer supply rotator to form a developer pre-storage portion storing the developer in an inner space in which the developer supply rotator is disposed in the developing device. The sheet-shaped member intersects with a virtual line connecting a rotation center of the developing roller and a rotation center of the developer supply rotator at 90±10 degrees when viewed in a cross section orthogonal to a rotation shaft of the developing roller or the developer supply rotator.
    Type: Application
    Filed: January 9, 2025
    Publication date: July 31, 2025
    Applicant: Ricoh Company, Ltd.
    Inventor: Kei SAITO
  • Publication number: 20250145770
    Abstract: A polyarylene sulfide resin composition includes: 100 parts by weight of (A) a polyarylene sulfide; and 0.1 to 5 parts by weight of (B) an organic silane coupling agent having at least one epoxy group, an amino group, and an isocyanate group, wherein, when a cumulative integral value from a molecular weight of 100 to 10,000 in a molecular weight distribution curve of (A) the polyarylene sulfide is taken as 100, the cumulative integrated value at a molecular weight of 4,000 is 48 to 53, and when a melt flow rate of (A) the polyarylene sulfide is defined as MFR1, and when the melt flow rate obtained after mixing (A) the polyarylene sulfide with an epoxy silane coupling agent at a weight ratio of 100:1, and heating the resulting mixture at 315.5° C. for 5 minutes is defined as MFR2, a rate of change (MFR2/MFR1) is not more than 0.085.
    Type: Application
    Filed: September 12, 2022
    Publication date: May 8, 2025
    Applicant: Toray Industries, Inc.
    Inventors: Tomohiro Atarashi, Hisashi Yamanoue, Kei Saito
  • Patent number: 12222664
    Abstract: A developing device includes a developer bearer rotatable in a rotation direction and forming a developing range, a holder, and an entrance seal. The holder has a facing face facing the developer bearer upstream from the developing range in the rotation direction, a support face defining a part of an outer face of the developing device, and a relay face extending from one end of the support face to one end of the relay face connected to the facing face to form an acute tip portion closer to the developing range than the one end. The entrance seal has a free end projecting from the one end as a cantilever, and a length of the entrance seal from a tip of the free end of the entrance seal to the one end is shorter than a length of the relay face from the acute tip portion to the one end.
    Type: Grant
    Filed: August 21, 2023
    Date of Patent: February 11, 2025
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kei Saito, Yoshihiro Fujiwara, Masaki Takahashi, Yuuki Tsuchiya
  • Patent number: 12216418
    Abstract: A powder conveyance device includes a conveyor that rotates in a rotation direction to convey powder and a first conveyance tube accommodating the conveyor. A second conveyance tube extends in an angled direction that is angled with respect to the first conveyance tube. The second conveyance tube communicates with the first conveyance tube. A swing member is disposed inside the second conveyance tube. The swing member swings in accordance with rotation of the conveyor. The swing member has one end that is detachably attached to the conveyor. The one end is detached from the conveyor in a detaching direction. A restrictor is disposed inside one of the first conveyance tube and the second conveyance tube. The restrictor restricts motion of the swing member in the detaching direction.
    Type: Grant
    Filed: October 12, 2023
    Date of Patent: February 4, 2025
    Assignee: RICOH COMPANY, LTD.
    Inventors: Naohiro Kawashima, Kei Saito
  • Publication number: 20240384046
    Abstract: A polyarylene sulfide resin composition includes: 100 parts by weight of (A) a polyarylene sulfide; and 10 to 200 parts by weight of (B) a glass fiber, wherein, when a cumulative integral value from a molecular weight of 100 to a molecular weight of 10,000 in a molecular weight distribution curve of (A) the polyarylene sulfide is taken as 100, the cumulative integrated value at a molecular weight of 4,000 is 48 to 53, and when a melt flow rate of the polyarylene sulfide is defined as MFR1, and when the melt flow rate obtained after mixing the polyarylene sulfide with an epoxy silane coupling agent at a weight ratio of 100:1, and heating the resulting mixture at 315.5° C. for 5 minutes is defined as MFR2, a rate of change represented by MFR2/MFR1 is not more than 0.085.
    Type: Application
    Filed: September 12, 2022
    Publication date: November 21, 2024
    Applicant: Toray Industries, Inc.
    Inventors: Koki Fukuyasu, Terasu Sasaki, Shunsuke Kondo, Kei Saito
  • Publication number: 20240384099
    Abstract: A polyarylene sulfide resin composition includes: 100 parts by weight of (A) a polyarylene sulfide; 10-100 parts by weight of (B) a glass fiber; and 1-20 parts by weight of (C) an olefin elastomer resin, wherein, when a cumulative integral value from a molecular weight of 100 to a molecular weight of 10,000 in a molecular weight distribution curve of (A) the polyarylene sulfide is taken as 100, the cumulative integrated value at a molecular weight of 4,000 is 48-53, and when a melt flow rate of (A) the polyarylene sulfide is defined as MFR1, and when the melt flow rate obtained after mixing (A) the polyarylene sulfide with an epoxy silane coupling agent at a weight ratio of 100:1, and heating the resulting mixture at 315.5° C. for 5 minutes is defined as MFR2, a rate of change (MFR2/MFR1) is not more than 0.085.
    Type: Application
    Filed: September 12, 2022
    Publication date: November 21, 2024
    Applicant: Toray Industries, Inc.
    Inventors: Tomohiro Atarashi, Hisashi Yamanoue, Kei Saito
  • Publication number: 20240287265
    Abstract: A polyarylene sulfide resin composition that including a polyarylene sulfide having a carboxyl group content of not less than 60 ?mol/g; and a glass fiber. Provided is a polyarylene sulfide resin composition that has excellent mechanical strength, particularly weld strength, generates less burrs, and has excellent adhesiveness to an epoxy resin. Also disclosed are articles made from such compositions as well as methods of making the compositions and article made therefrom.
    Type: Application
    Filed: September 12, 2022
    Publication date: August 29, 2024
    Applicant: Toray Industries, Inc.
    Inventors: Yoichi Hasegawa, Koki Fukuyasu, Yuki Okuda, Kei Saito
  • Publication number: 20240231257
    Abstract: A toner container (32) includes a rotatable container body (33). The container body includes an opening portion (33c) and a plurality of projections (33a). The opening portion is on a first end, which is opposite a second end, of the container body in a rotation axis direction. The plurality of projections are each protrude inward and have a slope inclined with respect to the rotation axis direction. The plurality of projections are disposed such that, out of two adjacent projections in the rotation axis direction, one projection closer to the first end of the container body in the rotation axis direction overlaps the other projection closer to the second end of the container body in the rotation axis direction, in an area of the one projection closer to the second end and an area of the other projection closer to the first end in the rotation axis direction.
    Type: Application
    Filed: March 4, 2022
    Publication date: July 11, 2024
    Inventors: Hideo YOSHIZAWA, Kei SAITO, Yuki OSHIKAWA
  • Publication number: 20240174858
    Abstract: A polyphenylene sulfide resin composition includes 100 parts by weight of a polyphenylene sulfide resin (A) having a melt viscosity of more than 200 Pa·s at a temperature of 310° C., a ratio L/D of an orifice length L to an orifice diameter D of 10 and a shear rate of 1,216/s, and 3 parts by weight to 25 parts by weight of an olefinic elastomer resin (B), which are mixed with each other, wherein the melt viscosity at the temperature of 320° C., the ratio L/D of the orifice length L to the orifice diameter D of 40 and the shear rate of 4,700/s is 120 Pa·s or more and 200 Pa·s or less, and a weight loss on heating is 0.8% by weight or less when heated in an air atmosphere at the temperature of 320° C. for 2 hours.
    Type: Application
    Filed: March 25, 2022
    Publication date: May 30, 2024
    Inventors: Hisashi Yamanoue, Tomohiro Atarashi, Kei Saito
  • Publication number: 20240134301
    Abstract: A toner container (32) includes a rotatable container body (33). The container body includes an opening portion (33c) and a plurality of projections (33a). The opening portion is on a first end, which is opposite a second end, of the container body in a rotation axis direction. The plurality of projections are each protrude inward and have a slope inclined with respect to the rotation axis direction. The plurality of projections are disposed such that, out of two adjacent projections in the rotation axis direction, one projection closer to the first end of the container body in the rotation axis direction overlaps the other projection closer to the second end of the container body in the rotation axis direction, in an area of the one projection closer to the second end and an area of the other projection closer to the first end in the rotation axis direction.
    Type: Application
    Filed: March 4, 2022
    Publication date: April 25, 2024
    Inventors: Hideo YOSHIZAWA, Kei SAITO, Yuki OSHIKAWA
  • Publication number: 20240126189
    Abstract: A powder conveyance device includes a conveyor that rotates in a rotation direction to convey powder and a first conveyance tube accommodating the conveyor. A second conveyance tube extends in an angled direction that is angled with respect to the first conveyance tube. The second conveyance tube communicates with the first conveyance tube. A swing member is disposed inside the second conveyance tube. The swing member swings in accordance with rotation of the conveyor. The swing member has one end that is detachably attached to the conveyor. The one end is detached from the conveyor in a detaching direction. A restrictor is disposed inside one of the first conveyance tube and the second conveyance tube. The restrictor restricts motion of the swing member in the detaching direction.
    Type: Application
    Filed: October 12, 2023
    Publication date: April 18, 2024
    Inventors: Naohiro KAWASHIMA, Kei SAITO
  • Publication number: 20240077813
    Abstract: A developing device includes a developer bearer rotatable in a rotation direction and forming a developing range, a holder, and an entrance seal. The holder has a facing face facing the developer bearer upstream from the developing range in the rotation direction, a support face defining a part of an outer face of the developing device, and a relay face extending from one end of the support face to one end of the relay face connected to the facing face to form an acute tip portion closer to the developing range than the one end. The entrance seal has a free end projecting from the one end as a cantilever, and a length of the entrance seal from a tip of the free end of the entrance seal to the one end is shorter than a length of the relay face from the acute tip portion to the one end.
    Type: Application
    Filed: August 21, 2023
    Publication date: March 7, 2024
    Inventors: Kei SAITO, Yoshihiro FUJIWARA, Masaki TAKAHASHI, Yuuki TSUCHIYA
  • Patent number: 11856930
    Abstract: A collar member is used for a spinning reel. The spinning reel has a reel body, a spool shaft that moves in a front-back direction with respect to the reel body, a pinion gear that rotates around the spool shaft, a rotor nut that rotates integrally with the pinion gear, and a bearing that is disposed between the spool shaft and the rotor nut in a radial direction and rotatably supports the rotor nut. The collar member is disposed between the spool shaft and the bearing in the radial direction. The collar member is formed by a resin material that has a linear expansion coefficient of 10×10?6 (1/° C.) or more and 50×10?6 (1/° C.) or less.
    Type: Grant
    Filed: June 24, 2022
    Date of Patent: January 2, 2024
    Assignee: Shimano Inc.
    Inventors: Koji Ochiai, Kei Saito, Akira Niitsuma, Satoshi Ikebukuro, Atsushi Kawamata
  • Patent number: 11819012
    Abstract: A spinning reel has a reel body, a spool shaft, a spool, a spool ring, and a drag knob. The spool ring is disposed on the external radial portion of a front flange of the spool. The drag knob is disposed in front of the spool shaft. As seen from the outside of the spool ring in the radial direction, an angle formed by a tangent line, which passes through a contact point between an external radial portion and a spherical boundary and which is tangent to the spherical boundary, and a straight line, which is orthogonal to the spool shaft and which passes through the contact point, is less than or equal to degrees. The drag knob is disposed inside the spherical boundary.
    Type: Grant
    Filed: July 27, 2022
    Date of Patent: November 21, 2023
    Assignee: Shimano Inc.
    Inventors: Akira Niitsuma, Atsushi Kawamata, Shu Kusuda, Kei Saito, Hirokazu Hirayama, Satoshi Ikebukuro, Yoshiyuki Takemoto
  • Patent number: 11754947
    Abstract: A toner container includes a container body, a gear, a held portion, an information storage device, a holding portion, and a connecting portion. The container body is rotatable around a rotation axis. The gear is disposed on a leading end of the toner container in the attaching direction of the toner container. The held portion is disposed such that the gear is exposed on the leading end in the attaching direction. The information storage device communicates with the body of the image forming apparatus. The holding portion is held by the held portion via the connecting portion. The information storage device, the holding portion, and the connecting portion are disposed at oblique positions excluding positions on a horizontal line and a vertical line. The connecting portion covers a part of the gear in a rotation direction and includes a rib-shaped portion that connects the held portion and the holding portion.
    Type: Grant
    Filed: March 29, 2022
    Date of Patent: September 12, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hideo Yoshizawa, Kei Saito, Yuki Oshikawa
  • Patent number: 11726418
    Abstract: A developer container to store developer includes a rotator, a bearing, and a seal. The rotator includes a rotary shaft made of metal. The bearing supports the rotary shaft. The seal is made of fiber, disposed toward an inside of the developer container in the bearing, and contacts an outer circumferential surface of the rotary shaft.
    Type: Grant
    Filed: May 16, 2022
    Date of Patent: August 15, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Naohiro Kawashima, Kei Saito, Kentarou Matsumoto, Kunihiro Ohyama
  • Patent number: 11716980
    Abstract: A spinning reel includes a reel body, a rotor, a bail arm, a rod, a coil spring, a swing member, and a tubular member. The rotor rotates with respect to the reel body. The bail arm is configured to swing with respect to the rotor. The bail arm has a bail and a bail support member that supports one end of the bail. The rod is connected to the bail support member. The coil spring is disposed around the outer circumference of the rod and presses the rod toward the bail support member. The swing member has a bottom that supports the coil spring and is swingably supported by the rotor. The tubular member is supported by the swing member. The tubular member is disposed in the inner circumference of the coil spring. The rod is configured to slide in accordance with a swing movement of the bail arm.
    Type: Grant
    Filed: June 9, 2022
    Date of Patent: August 8, 2023
    Assignee: Shimano Inc.
    Inventors: Atsushi Kawamata, Akira Niitsuma, Satoshi Ikebukuro, Kei Saito
  • Publication number: 20230122536
    Abstract: A spinning reel has a reel body, a spool shaft, a spool, a spool ring, and a drag knob. The spool ring is disposed on the external radial portion of a front flange of the spool. The drag knob is disposed in front of the spool shaft. As seen from the outside of the spool ring in the radial direction, an angle formed by a tangent line, which passes through a contact point between an external radial portion and a spherical boundary and which is tangent to the spherical boundary, and a straight line, which is orthogonal to the spool shaft and which passes through the contact point, is less than or equal to degrees. The drag knob is disposed inside the spherical boundary.
    Type: Application
    Filed: July 27, 2022
    Publication date: April 20, 2023
    Inventors: Akira NIITSUMA, Atsushi KAWAMATA, Shu KUSUDA, Kei SAITO, Hirokazu HIRAYAMA, Satoshi IKEBUKURO, Yoshiyuki TAKEMOTO
  • Patent number: 11609488
    Abstract: A screen including a light control sheet which includes a front surface and a rear surface and has a transparent state and an opaque state, and a transparent reflective layer that faces the rear surface. The front surface is positioned such that light from a projection device is applied in the opaque state. The opaque state includes a state in which an average diffuse reflectance of visible light applied to the front surface is 10% or more and less than 20%.
    Type: Grant
    Filed: December 23, 2021
    Date of Patent: March 21, 2023
    Assignee: TOPPAN Inc.
    Inventors: Kei Saito, Sohei Abe, Yuji Yano, Saori Matsuyama
  • Patent number: 11599061
    Abstract: An image forming apparatus includes a heating device including a heater, a developing device, and an airflow generation device. The heater includes a base, a heat generator, an electrode portion, and conductive portions. The conductive portions are disposed on one side and another side in a longitudinal direction in a heat generation region and spaced apart in a lateral direction intersecting the longitudinal direction. A maximum total value among total values of squares of current flowing in the conductive portions at longitudinal positions on the one side is larger than that on said another side. The developing device includes a rotating member and sliding portions. A sliding portion having highest temperature in operation is disposed on one side of the developing device being same as the one side of the heater in the longitudinal direction. The airflow generation device generates an airflow toward the one side of the developing device.
    Type: Grant
    Filed: August 16, 2022
    Date of Patent: March 7, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kei Saito, Tomoya Adachi, Yuusuke Furuichi