Patents Assigned to Bridgestone Tire Company Limited
  • Pneumatic tire having an improved uneven wear resistance
    Patent number: 4258691
    Abstract: A pneumatic tire having tread grooves and tread-ground contact areas separated from each other by the grooves is disclosed. The tread-ground contact area has an outwardly projected edge and is faced towards the tread grooves. That part of said outwardly projected edge which is located nearest the crown center of the tire has at its tip a minimum rubber thickness, thinner than a standard rubber thickness of the tread-ground contact area with the rubber thickness gradually decreasing towards the tip of the outwardly projecting edge. The tire has an improved uneven wear resistance, resulting in greater comfort, reduced vibration and noise and improved durability.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: March 31, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventor: Osamu Nakayama
  • Apparatus for supporting floor plates above substrate
    Patent number: 4258516
    Abstract: Apparatus for supporting floor plates above substrate comprising a supporting rod threadedly engaged with an upper female screw threaded sleeve fitted in a hole provided at a corner of the floor plate and threadedly engaged with a lower female screw threaded sleeve fitted in a center hole of a cylindrical rubber-like elastic body disposed on the substrate, said supporting rod being provided at its upper end with a slot adapted to be engaged with a driving tool and the upper threads of said supporting rod being oppositely handed to the lower threads thereof.
    Type: Grant
    Filed: April 11, 1979
    Date of Patent: March 31, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Osamu Mori, Takanao Yoshizawa, Kozo Samata
  • Cordierite, alumina, silica porous ceramic bodies coated with an activated alumina layer
    Patent number: 4258099
    Abstract: A ceramic porous body useful as a filtering material for molten metal is disclosed. The ceramic porous body, consisting essentially of cordierite, alumina and silica, is formed by covering surfaces of cell strands of a ceramic porous body skeleton having a bulk specific gravity of 0.25-0.55 with 3-40% by weight per the weight of the skeleton of an activated alumina layer and has an average diameter of interconnected voids of 0.3-5.0 mm, a pressure loss of 0.3-30.0 mm as a water-gauge pressure when passing air through the body of 1 cm thick at a rate of 1 m/sec., a microsurface area of not less than 10 m.sup.2 /g and a porosity of 75-95%.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: March 24, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventor: Tsuneaki Narumiya
  • Cordierite, silica, alumina porous ceramic body
    Patent number: 4257810
    Abstract: A ceramic porous body for use in filtering molten metal is disclosed. The ceramic porous body has a three-dimensionally network cellular structure with a plurality of interconnected voids and is characterized by having a pore size of 25-35 pores per linear centimeter in optional cut area, a bulk specific gravity of 0.3-0.7, a porosity of 75-90%, and a pressure loss of 4.8-30.0 mm as a water-gauge pressure when passing air through the body of 1 cm thickness at a rate of 1 m/sec.
    Type: Grant
    Filed: August 13, 1979
    Date of Patent: March 24, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventor: Tsuneaki Narumiya
  • Pneumatic tire having an improved chipping resistant property employing syndiotactic-1,2-polybutadiene in tread rubber
    Patent number: 4257468
    Abstract: A pneumatic tire having an improved chipping resistant property is disclosed. In the tire, the tread portion is formed with a vulcanizate of a rubber composition comprising 3-40 parts by weight of short fibers of syndiotactic-1,2-polybutadiene, 30-100 parts by weight of carbon black and 0.2-5 parts by weight of a p-phenylenediamine type antioxidant, on a basis of 100 parts by weight of a rubber selected from natural rubber, synthetic rubber and a blend thereof in an optional blending ratio.
    Type: Grant
    Filed: April 5, 1979
    Date of Patent: March 24, 1981
    Assignees: Bridgestone Tire Company Limited, Ube Industries Limited
    Inventors: Masaki Ogawa, Tamio Araki, Shinji Yamamoto
  • Process for producing flame-resistant foam resins
    Patent number: 4258139
    Abstract: A process for producing flame-resistant foam resins is disclosed. The flame-resistant foam resin is produced by reacting an organic polyisocyanate with urea.
    Type: Grant
    Filed: October 24, 1979
    Date of Patent: March 24, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Toshio Yukuta, Takumi Ishiwaka, Kiyoshi Usui
  • Method of producing a moisture- and heat-resistant flexible polyurethane foam
    Patent number: 4255526
    Abstract: A moisture- and heat-resistant flexible polyurethane foam, which is free from lowering of the foam hardness due to moisture absorption during or after the production of the foam under a high temperature and high humidity condition and free from development of scorch during the production of the foam, can be obtained by adding an amino acid or an amino acid analogous compound to a raw material mixture, and foaming the resulting mixture.
    Type: Grant
    Filed: August 27, 1979
    Date of Patent: March 10, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Toshio Yukuta, Hiroya Fukuda, Seiji Ishii
  • Polybutadiene rubber composition
    Patent number: 4255296
    Abstract: This invention relates to a composition comprising a polybutadiene rubber containing a polymer obtained by block or graft polymerization of cis-1,4-polybutadiene with syndiotactic (syn)-1,2-polybutadiene, alone or blended with the other diene rubber, said syn-1,2-polybutadiene being crystallized and in a short fiber-like shape, and a breaking resistance characteristic and reinforcement characteristic being considerably improved by specifying the diameter and length of said short fiber, which is suitable for various parts of tire or industrial materials, and further relates to a composition of said polybutadiene rubber to which a carbon black is added for preferably used as a chafer or tread of tire, and still further relates to said composition to which a carbon black and an antioxidant are added for preferably used as a rubber blend composition for side wall.
    Type: Grant
    Filed: November 28, 1978
    Date of Patent: March 10, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Masaki Ogawa, Tamio Araki
  • Tire pressure drop alarming apparatus
    Patent number: 4254398
    Abstract: This invention is concerned with a tire pressure drop alarming apparatus for signaling an abnormal pressure drop of a pneumatic tire by transforming the pressure drop into an electric signal.The apparatus comprises a resonating circuit including a resonance coil and a resonance condenser and includes a retaining body made of metal.
    Type: Grant
    Filed: September 27, 1978
    Date of Patent: March 3, 1981
    Assignees: Bridgestone Tire Company Limited, Mitaka Instrument Company Limited
    Inventors: Akira Matsuda, Norio Goshima, Shigeo Yasuda, Motoaki Iwasaki, Hiroshi Nishino
  • Method for forming a mark indication on a tire side wall
    Patent number: 4252589
    Abstract: A mark indication is formed on the tire side wall by sticking partially vulcanized thin rubber sheets provided with mark indications on one side of said sheets along the circumferential direction of the green case at the outer surface corresponding to the side wall of the green case formed on a former and tightly adhering the rubber sheet integrally to the side wall through molding the green case into a toroidal form and vulcanizing said green case.
    Type: Grant
    Filed: October 20, 1978
    Date of Patent: February 24, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Toshio Hayakawa, Shoji Yoshida, Katsuyuki Harakon
  • Withstand-voltage tire
    Patent number: 4252171
    Abstract: A tire having excellent withstand-voltage property, wear resistance and resistance against heat build-up is disclosed. The tire has a tread, at least the contact area of the tread with road surface being made of a rubber composition containing a specifically limited softening agent and a specifically limited carbon black.
    Type: Grant
    Filed: December 13, 1978
    Date of Patent: February 24, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Isamu Imai, Kazuo Koyama, Mitsuaki Maeda
  • Super rigid rubber composition and a tire using the same
    Patent number: 4250939
    Abstract: A rubber composition comprising a sulfur-vulcanizable rubber, N,N'-dithiodiamine, a thermosetting resin and a curing agent has a high dynamic modulus in the vulcanizate. A tire using the vulcanizate as a bead filler rubber has improved impact absorbing property and vibration damping property and is excellent in the ride feeling.
    Type: Grant
    Filed: October 16, 1978
    Date of Patent: February 17, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Shoson Shibata, Akio Sato, Yoshihiro Hayakawa, Fumio Bamba
  • Process for hydrocracking a waste rubber
    Patent number: 4251500
    Abstract: This invention relates to a process for hydrocracking a waste rubber such as used tires, used conveyor belts, used hoses etc., and more particularly to a process for hydrocracking such waste rubber with a specific catalyst obtained by mixing (1) a main catalyst of an iron compound with (2) an auxiliary catalyst of metal compounds of the Periodic Table, Group VI, based on a synergistic catalyst action with sulfur contained in said waste rubber so that said waste rubber is decomposed into an oil contents and carbon.
    Type: Grant
    Filed: October 18, 1978
    Date of Patent: February 17, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Minoru Morita, Tetsuya Takamatsu
  • Apparatus for floating and sinking fish breeding netted tanks
    Patent number: 4244323
    Abstract: An apparatus for floating and sinking fish breeding netted tanks comprising a floating and sinking mechanism composed of a flexible bag enclosed in a tubular frame and adapted to be supplied with a fluid under pressure and to remove it so as to float and sink the fish breeding netted tank.
    Type: Grant
    Filed: April 24, 1979
    Date of Patent: January 13, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventor: Shinji Morimura
  • Solid tire and wheel assembly for vehicle moving through a tubular conduit
    Patent number: 4244413
    Abstract: A solid tire and wheel assembly for vehicle moving through a tubular conduit having excellent abrasion resistance particularly excellent uneven wear resistance is produced by forming a composition layer composed of (a) a diene elastomer, (b) .alpha.,.beta.-ethylenically unsaturated carboxylic acid, (c) a divalent metal compound and (d) an organic peroxide on the outer circumferential surface of the metal rim of the wheel and curing said layer by heating.
    Type: Grant
    Filed: June 7, 1978
    Date of Patent: January 13, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Takuya Takahashi, Masayoshi Iijima, Norio Ishikawa
  • Vulcanizable rubber composition improved in sulfur blooming with metal alkylxanthate
    Patent number: 4242472
    Abstract: The present invention relates to a vulcanizable rubber composition improved in a sulfur blooming obtained by coagulatingly keeping a supersaturated sulfur within said rubber composition. For preventing said sulfur blooming, in the present invention, a surface active agent such as sodium or potassium ethylxanthate, sodium or potassium isopropylxanthate, dialkyldithiophosphoric acid, diphenylthiourea, mercaptobenzothiazole, diphenylthiocarbazone, sodium oleate, sodium stearate or octadecylamineacetate is added to a rubber composition obtained by compounding sulfur as a vulcanizing agent in the amount of 0.5 to 10 parts by weight in relation to 100 parts by weight of rubber which may be any of natural rubber, synthetic rubber and the mixtures thereof.
    Type: Grant
    Filed: February 8, 1979
    Date of Patent: December 30, 1980
    Assignee: Bridgestone Tire Company Limited
    Inventors: Takashi Hoshino, Setsuko Imaizumi, Seisuke Tomita
  • Hot-melt adhesion process for vulcanized rubber
    Patent number: 4227956
    Abstract: A vulcanized rubber composition containing at least 30% by weight, based on the amount of the rubber component, of syndiotactic-1,2-polybutadiene has a high adhesion, and can be easily and firmly adhered to another vulcanized rubber composition or to a porous material through a syndiotactic-1,2-polybutadiene thin film by a hot-melt adhesion process.
    Type: Grant
    Filed: May 7, 1979
    Date of Patent: October 14, 1980
    Assignee: Bridgestone Tire Company, Limited
    Inventors: Toshio Honda, Yukio Fukuura, Itsuo Tanuma, Hikaru Ishikawa, Masao Ogawa, Shozo Kojima, Kazunori Ueno
  • Flexible urethane foams having a low density and a method for producing said foams
    Patent number: 4226947
    Abstract: Flexible urethane foams having a low density and capable of preventing spontaneous combustion during production and storage are produced by compounding 5.0-12.0 parts by weight based on 100 parts by weight of polyhydroxylcompounds, of water and not less than 0.1 part by weight of aromatic amine antioxidant, further preferably not less than 0.01 part by weight of phosphorous acid triesters in the usual combination of polyhydroxyl compounds, polyisocyanates, water, catalysts, surfactants, foaming agent and other additives.
    Type: Grant
    Filed: October 24, 1978
    Date of Patent: October 7, 1980
    Assignee: Bridgestone Tire Company Limited
    Inventors: Toshio Yukuta, Hiroya Fukuda, Seiji Ishii, Kazuo Utsumi
  • Pneumatic tire for heavy duty vehicles
    Patent number: 4223712
    Abstract: A pneumatic tire for heavy duty vehicles comprises a tread divided by two circumferential zigzag grooves in a tread center zone including block patterns of elongated blocks circumferentially discontinuous with traverse grooves and side zones including circumferentially continuous ribs. The traverse grooves are provided in their mid portions 30-70% of their lengths with platforms making the grooves shallower 30-70% than their original depths. The pattern of the tread converts into a pattern of ribs formed by the circumferential zigzag grooves having branch grooves when the tread has worn more than 30-70%. The tire including the above tread pattern according to the invention is suitable for both use on paved hard roads and weak grounds.
    Type: Grant
    Filed: August 28, 1978
    Date of Patent: September 23, 1980
    Assignee: Bridgestone Tire Company, Limited
    Inventors: Norio Iwata, Hiroshi Kojima
  • Lug tires with uniform base rubber gauge
    Patent number: 4222424
    Abstract: A lug tire for agricultural machines and constructional vehicles provided with at least one discontinuous portion formed by decreasing a thickness of a base rubber at both end regions of a tread and arranged along the circumferential direction of the tire.
    Type: Grant
    Filed: December 14, 1978
    Date of Patent: September 16, 1980
    Assignee: Bridgestone Tire Company Limited
    Inventors: Junichi Tsuzura, Yukio Kojima