Patents Assigned to Junkosha Co., Ltd.
  • Patent number: 4677373
    Abstract: A sensor for detecting leaks of a corrosive liquid is provided comprising a pair of plate electrodes made of a conductive metal which is corroded by the liquid to be detected spaced apart and separated by an inner sheet of an electrically insulating material, the inner sheet having a plurality of through-holes, this entire construction being sealingly encased between a pair of outer insulating sheets, at least one of which has a plurality of through-holes. In use, if a leak occurs the liquid passes through the through-holes in the outer insulating sheet, dissolves a portion of one electrode and passes through the through-holes in the inner sheet to the second electrode, causing a short circuit resulting in a rapid and accurately measurable decrease in the resistance in the circuit and, therefore, detection of the leak.
    Type: Grant
    Filed: July 11, 1986
    Date of Patent: June 30, 1987
    Assignee: Junkosha Co., Ltd.
    Inventors: Satoru Kobayashi, Satoshi Tanaka
  • Patent number: 4649228
    Abstract: An electrical transmission line is provided comprising at least one elongate signal conductor, one or more other conductors placed away from and substantially parallel to said signal conductor, all conductors encased in an outer insulating resin covering having a rectangular cross-section, the signal conductor(s) being further encased in an inner insulating porous resin covering, the porous resin covering having an electrical shielding layer thereover.
    Type: Grant
    Filed: April 15, 1985
    Date of Patent: March 10, 1987
    Assignee: Junkosha Co., Ltd.
    Inventor: Hirosuke Suzuki
  • Patent number: 4596577
    Abstract: A sheet or tube of fluororesin material having continuous pores, particularly polytetrafluoroethylene, has a nap raised on at least one surface thereof, and is suitable for prosthetic use as a patch, or an artificial blood vessel. A method of manufacturing such napped fluororesin material comprises impregnating fluororesin material having continuous pores with water, freezing it, raising a nap thereon, and defrosting and dewatering it.
    Type: Grant
    Filed: April 21, 1982
    Date of Patent: June 24, 1986
    Assignee: Junkosha Co. Ltd.
    Inventor: Toshikazu Sato
  • Patent number: 4594638
    Abstract: A liquid leak detecting sensor in the form of a coaxial cable assembly is provided in which means are provided for enhancing the passage of leaks from the outer surface of the outer conductor into the sensing layer which separates the inner and outer conductors. The change in permittivity of the sensing layer caused by the leak enables rapid detection of the location of the leak along the cable.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: June 10, 1986
    Assignee: Junkosha Co. Ltd.
    Inventors: Hirosuke Suzuki, Satoru Kobayashi, Katsuo Shimosawa
  • Patent number: 4576861
    Abstract: A material for use as a gaseous diffusion electrode is provided. The material has improved durability resulting in long life. the material comprises a composite of a first layer of polytetrafluoroethylene (PTFE) containing a filler of a powdered electroconductive substance and a second layer of PTFE in bonded laminar contact with the first layer. The second layer preferably contains no electroconductive filler. The first and second layers are bonded together under pressure to form an intermediate composite and this intermediate composite is stretched, to produce the material of the invention which is a composite layered product of expanded PTFE having nodes interconnected by fibrils, one layer containing electroconductive material and the second layer preferably containing no electroconductive material. A catalytic substance can be incorporated onto or into at least the first layer by either deposition or by a filler of catalytic powder for use as the gas diffusing electrode of the invention.
    Type: Grant
    Filed: January 30, 1985
    Date of Patent: March 18, 1986
    Assignee: Junkosha Co. Ltd.
    Inventor: Hiroshi Kato
  • Patent number: 4567321
    Abstract: An improved, highly flexible flat multi-conductor electrical cable is provided, useful for example in robots wherein such cables may be flexed many times, comprising a plurality of conductor assemblies held in parallel relationship between layers of insulating coverings, the improvement comprising conductor assemblies having an elongate, non-conductive center core filament helically overwrapped along its longitudinal dimension by a first conductor in foil or tape form, such as copper foil, this first tape conductor having an outer covering of a conductive, low-friction material, the conductive covering being helically overwrapped along its longitudinal dimension by a second conductor in foil or tape form, such as copper foil, the second foil conductor being wrapped in a lay opposite to that of the first conductor, i.e. if one foil conductor is "S" wrapped, the other foil conductor is "Z" wrapped.
    Type: Grant
    Filed: September 24, 1984
    Date of Patent: January 28, 1986
    Assignee: Junkosha Co., Ltd.
    Inventor: Chiharu Harayama
  • Patent number: 4531049
    Abstract: A heating electric wire is provided having a heating portion electrically connected to a lead portion, the heating portion being a bundle of a plurality of elongate, electrically insulating tension members having a heating layer around the periphery of the bundle of tension members, the lead portion being a bundle of a plurality of elongate, electrical conducting wires, at least a portion of the insulating tension members being coupled to at least a portion of the conducting wires in the connection region between the heating and lead portions, the entire assembly having a heat resistant sheath around its periphery.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: July 23, 1985
    Assignee: Junkosha Co., Ltd.
    Inventor: Shunichi Sato
  • Patent number: 4517247
    Abstract: A shaped article having a synthetic resinous body and a thin fluoropolymer weld layer on its surface is formed by a process which comprises heating a heat conductive metallic core member, forming a thin fluoropolymer weld layer on the surface of the core member, treating the exposed surface of the fluoropolymer layer, forming a synthetic resinous body on the outer, treated surface of the fluoropolymer layer and removing the core member, such as by dissolving. In the shaped article thus produced, a thin fluoropolymer weld layer is formed on the surface of the synthetic resinous body, and the thickness of the fluoropolymer coating can be reduced. This permits the production of shaped articles at low cost and having high mechanical strength, even for complicated shapes. According to the invention, it is possible to produce articles having complex shapes such as corrosion resistant vessels, molds having good release characteristics, and so forth, at a comparatively low cost.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: May 14, 1985
    Assignee: Junkosha Co., Ltd.
    Inventors: Hirosuke Suzuki, Yoshiaki Sato
  • Patent number: 4478898
    Abstract: A method of manufacturing a porous tetrafluoroethylene tube comprises forming a sheet of tetrafluoroethylene containing a lubricant, winding it into a tubular shape, wrapping reinforcing material about the tubular shape to form a tubular product, rolling the tubular product so that it may have a uniform wall thickness, preheating the tubular product at a temperature lower than 327.degree. C., stretching the tubular product longitudinally, and heating it at a temperature higher than 327.degree. C., while holding it in its stretched position. The method may also be used to manufacture a tube containing 15 to 95% by weight of a filler.
    Type: Grant
    Filed: June 4, 1982
    Date of Patent: October 23, 1984
    Assignee: Junkosha Co., Ltd.
    Inventor: Hiroshi Kato
  • Patent number: 4454249
    Abstract: Reinforced easily moldable plastics are provided wherein particles of stretched porous polymer are incorporated into a plastic molding resin material to improve its physical properties without detracting from moldability. Particles or fragments of porous stretched forms of polyethylene, polypropylene, or polytetrafluoroethylene, are incorporated into a matrix of polytetrafluoroethylene polyvinylidene fluoride, or a copolymer of tetrafluoroethylene with perfluoroalkyl vinyl ether, hexafluoropropylene, ethylene, or trifluorochloroethylene.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: June 12, 1984
    Assignee: Junkosha Co., Ltd.
    Inventors: Hirosuke Suzuki, Chiaki Mizukami, Yoshiaki Sato
  • Patent number: 4382236
    Abstract: A new strip line cable is provided comprising a dielectric in tape form made of a porous, crystalline polymer and one or more pairs of electrical conductors, each pair of conductors having one conductor located on one side of said tape and the other conductor located on the opposite side of said tape and in substantially parallel relationship to the first conductor of the pair, the pairs of conductors being arranged in substantially parallel transverse relationship across said tape, and insulating layers made of a suitable non-porous plastic material placed over the conductors to affix them to said dielectric tape and encapsulate the cable assembly. The preferred tape dielectric is expanded, porous polytetrafluoroethylene.
    Type: Grant
    Filed: April 13, 1981
    Date of Patent: May 3, 1983
    Assignee: Junkosha Co., Ltd.
    Inventor: Hirosuke Suzuki
  • Patent number: 4340384
    Abstract: A colored, porous fluorocarbon material is provided wherein a porous layer of a colored dyeing-site resin is formed on all surfaces of the fluorocarbon material. This new material is made by a process whereby an auxiliary solvent which does not readily dissolve a dyeing-site resin, if at all, is added to a solution of the dyeing-site resin in a main solvent, and this is coated onto the surfaces of the fluorocarbon material and dried. The material may be dyed by adding dyestuff to the aforesaid solution or it may be dyed after coating and drying. The coated fluorocarbon material can be stretched.
    Type: Grant
    Filed: March 4, 1981
    Date of Patent: July 20, 1982
    Assignee: Junkosha Co., Ltd.
    Inventor: Haruo Nomi