Patents by Inventor Shigemasa Itabashi

Shigemasa Itabashi 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).

  • Patent number: 12104135
    Abstract: Provided is a lubricant composition including a bicyclic liquid crystal of formula (1), tricyclic liquid crystal compounds of formula (2), and formula (3). The composition is suitable for use in a clean environment, under a high vacuum, under high temperature and a bearing. R1 and R2 are the same or different from each other, and each is —OCH2CH2CH(R?)CH2CH2OR. R11 and R21 are the same or different from each other, and each is —OR. R12, R13, R22 and R23 are the same or different from each other, and each is hydrogen or a group —OR. R31 and R41 are the same or different from each other, and each is —OCH2CH2CH(R?)CH2CH2OR. R32, R33, R42, and R43 are the same or different from each other, and each is hydrogen or —OCH2CH2CH(R?)CH2CH2OR. R is a linear or branched CnH2n+1, 1?n?20, and R? is methyl or ethyl.
    Type: Grant
    Filed: May 24, 2022
    Date of Patent: October 1, 2024
    Assignees: NIPPON THOMPSON CO., LTD., USHIO CHEMIX CORPORATION
    Inventors: Yuichiro Haramoto, Shigemasa Itabashi, Ayana Takemura, Kazuo Okamoto, Hiroyuki Otsuki
  • Patent number: 11807825
    Abstract: Provided are a lubricant composition which is advantageous in that, when applied to a contact area of metal parts, the lubricant composition can suppress generation of rust and can exhibit excellent lubricating performance, and a bearing the lubricant composition having sealed therein. A lubricant composition comprising at least one dicyclic liquid crystal compound represented by the following formula (1), at least one tricyclic liquid crystal compound represented by the following formula (2), and halogen ions, wherein the content of the halogen ions in the lubricant composition is 1 to 900 ppm.
    Type: Grant
    Filed: August 11, 2020
    Date of Patent: November 7, 2023
    Assignees: NIPPON THOMPSON CO., LTD., Ushio Chemix Corporation
    Inventors: Kazuo Okamoto, Hiroyuki Otsuki, Shigemasa Itabashi, Ayana Takemura
  • Patent number: 11674102
    Abstract: Provided is a lubricant composition including a bicyclic liquid crystal of formula (1), and a tricyclic liquid crystal compound of formula (2), and having a mixing mass ratio of the bicyclic liquid crystal compound and tricyclic liquid crystal compound of 95:5 to 15:85. The composition is suitable for use in a clean environment, under a high vacuum, under high temperature and a bearing. R1 and R2 are the same or different from each other, and each is —OCH2CH2CH(R?)CH2CH2OR R11 and R21 are the same or different from each other, and each is —OR. R12, R13, R22 and R23 are the same or different from each other, and each is hydrogen or —OR. R is a linear or branched CnH2n+1, 1?n?20 and R? is methyl or ethyl.
    Type: Grant
    Filed: May 24, 2022
    Date of Patent: June 13, 2023
    Assignees: UNIVERSITY OF YAMANASHI, NIPPON THOMPSON CO., LTD., Ushio Chemix Corporation
    Inventors: Yuichiro Haramoto, Shigemasa Itabashi, Ayana Takemura, Kazuo Okamoto, Hiroyuki Otsuki
  • Publication number: 20220372387
    Abstract: Provided is a lubricant composition including a bicyclic liquid crystal of formula (1), and a tricyclic liquid crystal compound of formula (2), and having a mixing mass ratio of the bicyclic liquid crystal compound and tricyclic liquid crystal compound of 95:5 to 15:85. The composition is suitable for use in a clean environment, under a high vacuum, under high temperature and a bearing. R1 and R2 are the same or different from each other, and each is —OCH2CH2CH(R?)CH2CH2OR R11 and R21 are the same or different from each other, and each is —OR. R12, R13, R22 and R23 are the same or different from each other, and each is hydrogen or —OR. R is a linear or branched CnH2n+1, 1?n?20 and R? is methyl or ethyl.
    Type: Application
    Filed: May 24, 2022
    Publication date: November 24, 2022
    Applicants: UNIVERSITY OF YAMANASHI, NIPPON THOMPSON CO., LTD., Ushio Chemix Corporation
    Inventors: Yuichiro Haramoto, Shigemasa Itabashi, Ayana Takemura, Kazuo Okamoto, Hiroyuki Otsuki
  • Publication number: 20220364009
    Abstract: Provided are a lubricant composition which is advantageous in that, when applied to a contact area of metal parts, the lubricant composition can suppress generation of rust and can exhibit excellent lubricating performance, and a bearing the lubricant composition having sealed therein. A lubricant composition comprising at least one dicyclic liquid crystal compound represented by the following formula (1), at least one tricyclic liquid crystal compound represented by the following formula (2), and halogen ions, wherein the content of the halogen ions in the lubricant composition is 1 to 900 ppm.
    Type: Application
    Filed: August 11, 2020
    Publication date: November 17, 2022
    Applicants: NIPPON THOMPSON CO., LTD., Ushio Chemix Corporation
    Inventors: Kazuo Okamoto, Hiroyuki Otsuki, Shigemasa Itabashi, Ayana Takemura
  • Patent number: 11447711
    Abstract: This is to provide an electrically-conductive lubricant having characteristics in combination that it shows liquid crystallinity in a wide temperature range, retains low dynamic friction coefficient, has electrical-conductivity, has almost no loss due to evaporation, decomposition and the like, has a clean appearance, and emits fluorescence, and can find deterioration or leakage immediately. This electrically-conductive lubricant comprises at least one kind of the compound (1) represented by the formula (1): 12:8 wherein, R11 and R21 are the same or different from each other, and each is hydrogen or a group —OCH2CH2CH(R?)CH2CH2OR (R is a linear or branched CnH2n+1, 4?n?12, and R? is methyl or ethyl), and R12, R13, R22 and R23 are the same or different from each other, and each is a group —OCH2CH2CH(R?)CH2CH2OR (R is a linear or branched CnH2n+1, 4?n?12, and R? is methyl or ethyl)].
    Type: Grant
    Filed: July 16, 2019
    Date of Patent: September 20, 2022
    Assignees: UNIVERSITY OF YAMANASHI, NIPPON THOMPSON CO., LTD., Ushio Chemix Corporation
    Inventors: Yuichiro Haramoto, Shigemasa Itabashi, Ayana Takemura, Kazuo Okamoto, Hiroyuki Otsuki
  • Publication number: 20220282175
    Abstract: Provided is a lubricant composition including a bicyclic liquid crystal of formula (1), tricyclic liquid crystal compounds of formula (2), and formula (3). The composition is suitable for use in a clean environment, under a high vacuum, under high temperature and a bearing. R1 and R2 are the same or different from each other, and each is —OCH2CH2CH(R?)CH2CH2OR. R11 and R21 are the same or different from each other, and each is —OR. R12, R13, R22 and R23 are the same or different from each other, and each is hydrogen or a group —OR. R31 and R41 are the same or different from each other, and each is —OCH2CH2CH(R?)CH2CH2OR. R32, R33, R42, and R43 are the same or different from each other, and each is hydrogen or —OCH2CH2CH(R?)CH2CH2OR. R is a linear or branched CnH2n+1, 1?n?20, and R? is methyl or ethyl.
    Type: Application
    Filed: May 24, 2022
    Publication date: September 8, 2022
    Applicants: UNIVERSITY OF YAMANASHI, NIPPON THOMPSON CO., LTD., Ushio Chemix Corporation
    Inventors: Yuichiro Haramoto, Shigemasa Itabashi, Ayana Takemura, Kazuo Okamoto, Hiroyuki Otsuki
  • Publication number: 20210348078
    Abstract: This is to provide an electrically-conductive lubricant having characteristics in combination that it shows liquid crystallinity in a wide temperature range, retains low dynamic friction coefficient, has electrical-conductivity, has almost no loss due to evaporation, decomposition and the like, has a clean appearance, and emits fluorescence, and can find deterioration or leakage immediately. This electrically-conductive lubricant comprises at least one kind of the compound (1) represented by the formula (1): [wherein, R11 and R21 are the same or different from each other, and each is hydrogen or a group —OCH2CH2CH(R?)CH2CH2OR (R is a linear or branched CnH2n+1, 4?n?12, and R? is methyl or ethyl), and R12, R13, R22 and R23 are the same or different from each other, and each is a group —OCH2CH2CH(R?)CH2CH2OR (R is a linear or branched CnH2n+1, 4?n?12, and R? is methyl or ethyl)].
    Type: Application
    Filed: July 16, 2019
    Publication date: November 11, 2021
    Applicants: UNIVERSITY OF YAMANASHI, NIPPON THOMPSON CO., LTD., Ushio Chemix Corporation
    Inventors: Yuichiro Haramoto, Shigemasa Itabashi, Ayana Takemura, Kazuo Okamoto, Hiroyuki Otsuki
  • Patent number: 11067123
    Abstract: A linear motion guide unit has sleeves which form return passages and are formed of a high temperature resistant resin material which allows use in a high temperature environment. In the linear motion guide unit, spaces serving as grease pools are formed in the sleeves inserted into insertion holes of a carriage. The sleeves are formed of a thermoplastic resin whose heat distortion temperature is higher than 80° C. Each sleeve is formed by combining split circular members obtained by dividing a cylindrical member into two pieces along the longitudinal direction, and a plurality of grooves which become spaces are formed on the inner circumferential surfaces of the sprit circular members through cutting orthogonal to a parting plane between the split circular members.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: July 20, 2021
    Assignee: NIPPON THOMPSON CO., LTD.
    Inventors: Ayana Takemura, Shigemasa Itabashi
  • Publication number: 20210190141
    Abstract: A linear motion guide unit has sleeves which form return passages and are formed of a high temperature resistant resin material which allows use in a high temperature environment. In the linear motion guide unit, spaces serving as grease pools are formed in the sleeves inserted into insertion holes of a carriage. The sleeves are formed of a thermoplastic resin whose heat distortion temperature is higher than 80° C. Each sleeve is formed by combining split circular members obtained by dividing a cylindrical member into two pieces along the longitudinal direction, and a plurality of grooves which become spaces are formed on the inner circumferential surfaces of the sprit circular members through cutting orthogonal to a parting plane between the split circular members.
    Type: Application
    Filed: December 19, 2019
    Publication date: June 24, 2021
    Inventors: Ayana TAKEMURA, Shigemasa ITABASHI
  • Publication number: 20120230623
    Abstract: A rolling-contact bearing has an outer ring, an inner ring or a shaft rotational relative to the outer ring and a full complement of rollers disposed for rotation between the outer ring and the shaft. A semisolid gel-like lubricant composed of a mixture of a gelling agent and lubricating oil is packed into interstices or gaps between the outer ring and the rollers and among the adjacent rollers to retain surely the rollers on a circular inside surface of the outer ring. The gel-like lubricant is composed of the lubricating oil of mineral oil or base oil, and a powdery oil gelling agent based on amino acids.
    Type: Application
    Filed: February 22, 2012
    Publication date: September 13, 2012
    Applicant: NIPPON THOMPSON CO., LTD.
    Inventors: Kengo HIDANO, Shoji Nagao, Shigemasa Itabashi, Akihide Yanagitani
  • Patent number: 7108426
    Abstract: The invention provides a guide unit in which a slider is provided on a rail. The slider comprises a casing and an end cap provided on one end of the casing. The end cap comprises a raceway path which is constituted jointly by the casing and the rail. A direction changing path is provided in the end cap and a return path is provided in the casing. An oil retaining sleeve of porous structure is inserted into the return path. The slider circulates rolling elements in the raceway path, direction changing path and oil retaining sleeve. In the guide unit, a cylindrical guide member is interposed between the direction changing path of the end cap and the oil retaining sleeve. The ratio of a length in the axis line direction of the guide member to the diameter of the rolling element may be between 0.3 to 3.0.
    Type: Grant
    Filed: August 20, 2004
    Date of Patent: September 19, 2006
    Assignee: Nippon Thompson Co. Ltd.
    Inventors: Shigemasa Itabashi, Norimasa Agari
  • Publication number: 20060023977
    Abstract: A coupled structure of rolling elements which is capable of adequately supplying a lubricating oil component to the rolling elements without waste of the lubricating oil component, and a bearing using the coupled structure. In the coupled structure of rolling elements (1) including a coupled assembly (3) of rolling elements (1) coupled by regularly arranging the rolling elements (1) such as needle rollers in a direction at right angles to the longitudinal direction of the rolling element (1) and interposing a retaining material (2) formed of a solid lubricant between the rolling elements (1). A feature is that a curved-face (1a) of each of the rolling elements (1) exposed on one of faces of the coupled assembly (3) is wider than a curved-face (1b) of the rolling element (1) exposed on the other face of the coupled assembly (3).
    Type: Application
    Filed: June 24, 2005
    Publication date: February 2, 2006
    Applicant: NIPPON THOMPSON CO., LTD.
    Inventor: Shigemasa Itabashi
  • Publication number: 20050041896
    Abstract: The present invention has as its task the provision of a guide unit capable of the wear of an oil retaining sleeve. To accomplish the above-described task, in the invention there is provided a guide unit in which a slider 2 is provided in a rail 1, the slider 2 comprising a casing 3 and an end cap 4 provided at least at one end of the casing 3, which comprises a raceway path a which is constituted jointly by the casing 3 and the rail 1, a direction changing path 9 which is provided in the end cap 4, a return path c which is provided in the casing 3, and an oil retaining sleeve 8 of porous structure which is inserted into the return path c, and which circulates rolling elements bin the raceway path a, the direction changing path 9 and said oil retaining sleeve 8.
    Type: Application
    Filed: August 20, 2004
    Publication date: February 24, 2005
    Inventors: Shigemasa Itabashi, Norimasa Agari
  • Patent number: 6729761
    Abstract: A linear motion guide unit is disclosed in which a joint tube connects between a turnaround and a return passage of a sleeve made of sintered resinous material to ensure smooth turnabout of rolling elements and further in which lubricant can be supplied to the rolling elements for a prolonged period, thereby refining the durability. A slider is comprised of a sleeve for a return passage held with clearance fit in a through-hole of a carriage in a way lining major area of the through-hole with only forward and aft ends of the through-hole being left naked, a spacer with a lug having a radially inside curved half for a turnaround and an inside part for a joint tube to make up for any one end of the return passage joining with the radially inside curved half, and an end cap having a radially outside half for the turnaround and an outside part for the joint tube to make up for any one end of the return passage joining with the radially outside curved half.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: May 4, 2004
    Assignee: Nippon Thompson Co., Ltd.
    Inventors: Takeshi Matsui, Shigemasa Itabashi, Toyohisa Ishihara
  • Patent number: 6712511
    Abstract: A linear motion guide unit is disclosed in which a slider moves relatively of and along a track rail by virtue of rolling elements of balls or rollers. The rolling elements are allowed to recirculate from a load raceway formed between the track rail and the slider to a non-loaded area composed of a turnaround formed in the slider to communicate with the load raceway, and a return passage formed in the slider to communicate with the turnaround. The return passage is encircled with a sintered resinous member of porous texture. Lubricant absorbed and held in voids in the sintered resinous member can be supplied over a prolonged period to the rolling elements, thereby lubricating the rolling elements to make the frictional resistance less, which might be encountered when the slider moves on the track rail, and ultimately helping ensure the improvement in durability.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: March 30, 2004
    Assignee: Nippon Thompson Co., Ltd.
    Inventors: Takeshi Matsui, Takashi Yatsu, Shigemasa Itabashi
  • Publication number: 20030053724
    Abstract: A linear motion guide unit is disclosed in which a joint tube connects between a turnaround and a return passage of a sleeve made of sintered resinous material to ensure smooth turnabout of rolling elements and further in which lubricant can be supplied to the rolling elements for a prolonged period, thereby refining the durability. A slider is comprised of a sleeve for a return passage held with clearance fit in a through-hole of a carriage in a way lining major area of the through-hole with only forward and aft ends of the through-hole being left naked, a spacer with a lug having a radially inside curved half for a turnaround and an inside part for a joint tube to make up for any one end of the return passage joining with the radially inside curved half, and an end cap having a radially outside half for the turnaround and an outside part for the joint tube to make up for any one end of the return passage joining with the radially outside curved half.
    Type: Application
    Filed: September 10, 2002
    Publication date: March 20, 2003
    Applicant: NIPPON THOMPSON CO., LTD
    Inventors: Takeshi Matsui, Shigemasa Itabashi, Toyohisa Ishihara
  • Patent number: 6533458
    Abstract: A linear motion guide unit is disclosed wherein rolling elements are allowed to run smoothly through a turnaround and less subject to wear. Separators connected to elongated coupler members are allowed to travel ahead together with the rolling elements through a recirculating passage, which is composed of a load raceway, a return passage and turnarounds. The separator are each made unchanged in thickness at a limited zone over which a sliding contact point thereof with the associated rolling element changes place from S1 to S12 when the separator moves through the turnaround. The coupler member is made in the form of a flexible strip kept substantially constant in cross section throughout the overall length to bend uniformly with a fixed radius RB of curvature when moving in the turnaround.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: March 18, 2003
    Assignee: Nippon Thompson Co., Ltd.
    Inventor: Shigemasa Itabashi
  • Patent number: 6461045
    Abstract: A linear motion guide unit is disclosed wherein lubricant-containing members of sintered resinous components are fixed to core metals with either of mechanical means and adhesives whereby the lubricant-containing members may be kept in an accurate sliding contact with the raceway grooves on the track rail. Lubricating plate assemblies attached on end caps by bolts are each composed of the lubricant-containing member of sintered resinous component, core metal and dustproof cover. The lubricant-containing members are each fixed on the associated core metal with adhesives or with mechanical means such as claws, grasping fingers or the like, which are formed on the core metals. The core metals have rigidity sufficient to protect the lubricant-containing members from deformation, resulting in keeping the highly accurate sliding contact relation of the lubricant-containing members with the raceway grooves on the track rail.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: October 8, 2002
    Assignee: Nippon Thompson Co., Ltd.
    Inventors: Akihiko Kamimura, Shigemasa Itabashi
  • Publication number: 20020114544
    Abstract: A linear motion guide unit is disclosed in which a slider moves relatively of and along a track rail by virtue of rolling elements of balls or rollers. The rolling elements are allowed to recirculate from a load raceway formed between the track rail and the slider to a non-loaded area composed of a turnaround formed in the slider to communicate with the load raceway, and a return passage formed in the slider to communicate with the turnaround. The return passage is encircled with a sintered resinous member of porous texture. Lubricant absorbed and held in voids in the sintered resinous member can be supplied over a prolonged period to the rolling elements, thereby lubricating the rolling elements to make the frictional resistance less, which might be encountered when the slider moves on the track rail, and ultimately helping ensure the improvement in durability.
    Type: Application
    Filed: February 21, 2001
    Publication date: August 22, 2002
    Inventors: Takeshi Matsui, Takashi Yatsu, Shigemasa Itabashi