Patents by Inventor Shizuo Yamanaka

Shizuo Yamanaka 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: 9233573
    Abstract: A nib, among other parts which constitute a writing instrument, is made of a synthetic resin material in which engineering plastic is used. An ink supply wick includes a wick cover. An outer shape of a wick cover is determined such that it is attached to an outer periphery of the ink supply wick between the nib and the ink supply wick and is made to closely adhere to an inner periphery of the nib at least at the tip of the nib. A space between the nib and the ink supply wick is filled with the wick cover. The nib is made of a synthetic resin material in which engineering plastic is used. Therefore, the nib wear resistant and duration of the nib or the writing instrument can be extended.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: January 12, 2016
    Inventor: Shizuo Yamanaka
  • Patent number: 8801314
    Abstract: A nib piece with high roundness is obtained in the following manner: in the forming of the nib piece, a punched hole is formed in a base portion of a punched plate which is to be bent; the base portion of the punched plate is bent and shaped into a tubular structure; a pipe member which is aligned with and accommodated in the tubular body, is disposed in an inner portion of the base portion of the punched plate having been bent; and the punched plate is shaped to obtain a structure to wrap an outer periphery of the pipe member. The punched plate includes an engageable joint portion, such as a protrusion and a recess, which engage each other and form a hooked edge when the punched plate is bent into a cylindrical form.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: August 12, 2014
    Inventor: Shizuo Yamanaka
  • Patent number: 8475071
    Abstract: A nib of a writing instrument is made of a carbon-resin mixture obtained by mixing a plastic material with carbon fiber. An ink feed core is provided with a nib cover. The nib cover is disposed on an outer periphery of the ink feed core between the nib and the ink feed core. The nib cover is configured to closely adhere at least to an inner periphery of the nib at the tip of the nib. A space defined between the nib and the ink feed core is filled up with the nib cover. The nib is made of a carbon-resin mixture obtained by mixing a plastic material with carbon fiber. With this configuration, a nib having high wear resistance can be obtained and duration of the nib and the writing instrument can be prolonged.
    Type: Grant
    Filed: May 7, 2010
    Date of Patent: July 2, 2013
    Inventor: Shizuo Yamanaka
  • Publication number: 20130156488
    Abstract: A nib, among other parts which constitute a writing instrument, is made of a synthetic resin material in which engineering plastic is used. An ink supply wick includes a wick cover. An outer shape of a wick cover is determined such that it is attached to an outer periphery of the ink supply wick between the nib and the ink supply wick and is made to closely adhere to an inner periphery of the nib at least at the tip of the nib. A space between the nib and the ink supply wick is filled with the wick cover. The nib is made of a synthetic resin material in which engineering plastic is used. Therefore, the nib wear resistant and duration of the nib or the writing instrument can be extended.
    Type: Application
    Filed: December 13, 2012
    Publication date: June 20, 2013
    Inventor: Shizuo Yamanaka
  • Publication number: 20120057924
    Abstract: A nib piece with high roundness is obtained in the following manner: in the forming of the nib piece, a punched hole is formed in a base portion of a punched plate which is to be bent; the base portion of the punched plate is bent and shaped into a tubular structure; a pipe member which is aligned with and accommodated in the tubular body, is disposed in an inner portion of the base portion of the punched plate having been bent; and the punched plate is shaped to obtain a structure to wrap an outer periphery of the pipe member. The punched plate includes an engageable joint portion, such as a protrusion and a recess, which engage each other and form a hooked edge when the punched plate is bent into a cylindrical form.
    Type: Application
    Filed: September 1, 2011
    Publication date: March 8, 2012
    Inventor: Shizuo YAMANAKA
  • Publication number: 20110274478
    Abstract: A nib of a writing instrument is made of a carbon-resin mixture obtained by mixing a plastic material with carbon fiber. An ink feed core is provided with a nib cover. The nib cover is disposed on an outer periphery of the ink feed core between the nib and the ink feed core. The nib cover is configured to closely adhere at least to an inner periphery of the nib at the tip of the nib. A space defined between the nib and the ink feed core is filled up with the nib cover. The nib is made of a carbon-resin mixture obtained by mixing a plastic material with carbon fiber. With this configuration, a nib having high wear resistance can be obtained and duration of the nib and the writing instrument can be prolonged.
    Type: Application
    Filed: May 7, 2010
    Publication date: November 10, 2011
    Inventor: Shizuo Yamanaka
  • Patent number: 6652177
    Abstract: A highly durable conical nib is provided which also realizes a significant improvement in a nib productivity and a significant cost reduction. The conical nib comprises: a plurality of separated combtooth pieces being able to converge progressively toward front ends thereof and combine to form a virtually conical shape and that the front ends thereof combine to form a virtually spherical shape; a holding member capable of arranging the combtooth pieces along a circumference; and a converging member capable of converging these combtooth pieces; wherein the plurality of separated combtooth pieces are assembled by the holding member and the converging member, both separate from the combtooth pieces, into a conical nib having a writing tip at the front end thereof and an ink feeding path between each combtooth piece.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: November 25, 2003
    Inventors: Nobuhiko Shimada, Shizuo Yamanaka
  • Publication number: 20030152415
    Abstract: A highly durable conical nib is provided which also realizes a significant improvement in a nib productivity and a significant cost reduction. The conical nib comprises: a plurality of separated combtooth pieces being able to converge progressively toward front ends thereof and combine to form a virtually conical shape and that the front ends thereof combine to form a virtually spherical shape; a holding member capable of arranging the combtooth pieces along a circumference; and a converging member capable of converging these combtooth pieces; wherein the plurality of separated combtooth pieces are assembled by the holding member and the converging member, both separate from the combtooth pieces, into a conical nib having a writing tip at the front end thereof and an ink feeding path between each combtooth piece.
    Type: Application
    Filed: November 27, 2002
    Publication date: August 14, 2003
    Applicant: Kazue Yamanaka
    Inventors: Nobuhiko Shimada, Shizuo Yamanaka
  • Patent number: 5957610
    Abstract: A penpoint has a base portion and a plurality of comb-tooth pieces and a converging member fitted over the portion of the penpoint body between the base portion and the comb-tooth pieces. The uniform pressure of the converging member converges the comb-tooth pieces front ends into an undistorted hemispheric writing portion having ink passages between the adjoining comb-tooth pieces. When the penpoint is pressed against paper with the pen axis inclined, the front ends of the comb-tooth pieces shift and elastically deform to expand the outer diameter of the hemispheric portion. When pressure is relieved it returns to its original hemispherical shape. The thickness of strokes varies according to writing pressure. The penpoint can write in any direction.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: September 28, 1999
    Inventor: Shizuo Yamanaka
  • Patent number: 5902064
    Abstract: A conical penpoint is disclosed which resiliently deflects at its end by the pressure of writing to allow the thickness of written lines to be varied easily. The conical penpoint comprises: a penpoint body having a cylindrical base portion and a conical portion formed of a plurality of comb-tooth pieces continuous to and extending forwardly from the base portion; and an ink supply core installed inside the penpoint body and extending longitudinally therein. The front ends of the comb-tooth pieces are joined together so that the front ends of the adjacent comb-tooth pieces are in resilient contact with each other. When the apex portion formed by the joined front ends of the comb-tooth pieces is pressed against paper with its axis at an angle with respect to the paper, the penpoint elastically deforms allowing the thickness of written lines to be varied.
    Type: Grant
    Filed: July 7, 1997
    Date of Patent: May 11, 1999
    Inventor: Shizuo Yamanaka
  • Patent number: 5587017
    Abstract: A steel sheet is plated with a molten metal in a plating tank. A buffer member is provided between a sink roll submerged in the melt in the plating tank and the side wall of tank at its delivery end from which the plated steel sheet emerges. During plating, the buffer member decelerates the melt flows coming from below the sink roll so as to settle the suspended dross in the melt. The buffer member may be in the form of a rod or a plate. If desired, it may be combined with a shield plate provided below the sink roll or a raised portion formed on the bottom of the plating tank.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: December 24, 1996
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Shizuo Yamanaka, Takao Hashimoto
  • Patent number: 5015113
    Abstract: A multiangular pen comprising a multiangular pen nib; a pen core having holder pieces fitted the surface of the pen nib and a rod-like connector formed integral to the base end of the holder pieces, said pen core being made by tamping and molding a fibers material, having liquid permeability and serving to hold the pen nib with its holder pieces fitted the surface of the pen nib; and a penholder for housing a pen nib assembly of the pen nib and the pen core; wherein the body of said pen core is inserted into the ink holding member.
    Type: Grant
    Filed: December 6, 1988
    Date of Patent: May 14, 1991
    Inventor: Shizuo Yamanaka
  • Patent number: 4986686
    Abstract: A multiangular pen comprising a multiangular pen nib; a pen core having holder pieces fitted the surface of the pen nib and a rod-like connector formed integral to the base end of the holder pieces, said pen core being made by tamping and molding a fibers material, having liquid permeability and serving to hold the pen nib with its holder pieces fitted the surface of the pen nib; and a penholder for housing a pen nib assembly of the pen nib and the pen core; wherein the body of said pen core is inserted into the ink holding member.
    Type: Grant
    Filed: August 8, 1989
    Date of Patent: January 22, 1991
    Inventor: Shizuo Yamanaka
  • Patent number: 4986684
    Abstract: This invention presents a multiangular pen in which a pen nib is inserted and housed in a pen nib housing hole provided on a pen nib holder sleeve. Further, a push sleeve having a guide hole extending in its longitudinal direction and communicating with the pen nib housing hole is fitted into the pen nib housing hole at the back end side of the pen nib holder sleeve to support the pen nib. In the guide hole and the pen nib housing hole, an ink introducing core is inserted.
    Type: Grant
    Filed: August 8, 1989
    Date of Patent: January 22, 1991
    Inventor: Shizuo Yamanaka
  • Patent number: 4386867
    Abstract: A pen nib construction comprising a pen nib and a holder in which the pen nib is fitted. The pen nib is constructed by a plurality of pen nib pieces fixed back-to-back to each other and forming an ink channel extending axially, and the pen nib is provided at its pointed end with long splits and relatively short recesses which are disposed alternately and at equal angular distances. The pen nib contains an ink-containing portion near its pointed end. One end of the holder is divided into a plurality of ink feed tongues which are in contact with the outer surface of the pen nib. The other end of the holder is connected to an ink reservoir of the pen. At least one of the pen nib pieces is provided on its intermediate portion with another split which connects the ink channel with outside of the pen nib. Thus, ink is supplied from the ink reservoir to the pointed end of the pen nib through a plurality of passages including the ink channel and the narrow gap between the pen nib and the ink feed tongues.
    Type: Grant
    Filed: March 24, 1981
    Date of Patent: June 7, 1983
    Inventor: Shizuo Yamanaka
  • Patent number: D329660
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: September 22, 1992
    Inventor: Shizuo Yamanaka
  • Patent number: D686282
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: July 16, 2013
    Inventor: Shizuo Yamanaka
  • Patent number: D688306
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: August 20, 2013
    Inventor: Shizuo Yamanaka
  • Patent number: D690363
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: September 24, 2013
    Inventor: Shizuo Yamanaka
  • Patent number: D692055
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: October 22, 2013
    Inventor: Shizuo Yamanaka