Patents by Inventor Yukinori Sawa
Yukinori Sawa 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: 11148460Abstract: To provide a writing instrument capable of further improving durability of a writing nib without impairing writing performance even when writing is performed with a heavy writing load. A writing instrument A having a writing part formed of at least a writing nib 30 made of a porous body and a retainer 40 made of a hard material, in which the protrusion amount of the distal end of the writing nib 30 from the retainer 40 is 0.65 mm or more and 1.05 mm or less and/or 40% or more and 65% or less of the thickness of the writing nib 30.Type: GrantFiled: August 24, 2017Date of Patent: October 19, 2021Assignee: Mitsubishi Pencil Company, LimitedInventors: Hitoshi Suzuki, Kouichi Hirano, Yukinori Sawa, Toshimi Kamitani
-
Publication number: 20190193454Abstract: To provide a writing instrument capable of further improving durability of a writing nib without impairing writing performance even when writing is performed with a heavy writing load. A writing instrument A having a writing part formed of at least a writing nib 30 made of a porous body and a retainer 40 made of a hard material, in which the protrusion amount of the distal end of the writing nib 30 from the retainer 40 is 0.65 mm or more and 1.05 mm or less and/or 40% or more and 65% or less of the thickness of the writing nib 30.Type: ApplicationFiled: August 24, 2017Publication date: June 27, 2019Inventors: Hitoshi SUZUKI, Kouichi HIRANO, Yukinori SAWA, Toshimi KAMITANI
-
Patent number: 8944716Abstract: An applicator cap is closed on the front side and opening on the rear side, covering an applying part provided in the front end of a barrel cylinder of an applicator, from the rear-side opening, and detachably fitted on the barrel cylinder so as to be able to seal and keep the surrounding space of the applying part airtight, and includes a holding portion formed such that the middle part of the cap with respect to the axial direction is smaller in outside diameter than the front end with respect to the axial direction.Type: GrantFiled: September 1, 2010Date of Patent: February 3, 2015Assignee: Mitsubishi Pencil Company, LimitedInventors: Yukinori Sawa, Tooru Nakajima
-
Publication number: 20120141189Abstract: An applicator cap is closed on the front side and opening on the rear side, covering an applying part provided in the front end of a barrel cylinder of an applicator, from the rear-side opening, and detachably fitted on the barrel cylinder so as to be able to seal and keep the surrounding space of the applying part airtight, and includes a holding portion formed such that the middle part of the cap with respect to the axial direction is smaller in outside diameter than the front end with respect to the axial direction.Type: ApplicationFiled: September 1, 2010Publication date: June 7, 2012Applicant: Mitsubishi Pencil Company, LimitedInventors: Yukinori Sawa, Tooru Nakajima
-
Patent number: 7837404Abstract: An applicator which includes a rear barrel 1; an ink occlusion element 10 accommodated in rear barrel 1; an ink occlusion element receiver 20 opposing the front end part of ink occlusion element 10; a see-through front barrel 30 fitted to the opening of rear barrel 1, a detection tube 40 inserted in front barrel 30 for flowing ink from ink occlusion element 10; a joint core 50 supported by detection tube 40 and flowing out ink from ink occlusion element 10; and a pen core 60 supported by detection tube 40 and disposed on the opposite side of joint core 50 with a detection space 63 from joint core 50. Detection tube 40, joint core 50 and pen core 60 are formed into an integral structure. It is possible to exactly grasp the ink end state in a visual manner, based on the presence/absence of ink in detection space 63 of detection tube 40.Type: GrantFiled: August 13, 2004Date of Patent: November 23, 2010Assignee: Mitsubishi Pencil Co., Ltd.Inventors: Atsushi Iwasa, Yukinori Sawa, Akira Fukai, Takahiro Osada
-
Publication number: 20080193197Abstract: An applicator which includes a rear barrel 1; an ink occlusion element 10 accommodated in rear barrel 1; an ink occlusion element receiver 20 opposing the front end part of ink occlusion element 10; a see-through front barrel 30 fitted to the opening of rear barrel 1, a detection tube 40 inserted in front barrel 30 for flowing ink from ink occlusion element 10; a joint core 50 supported by detection tube 40 and flowing out ink from ink occlusion element 10; and a pen core 60 supported by detection tube 40 and disposed on the opposite side of joint core 50 with a detection space 63 from joint core 50. Detection tube 40, joint core 50 and pen core 60 are formed into an integral structure. It is possible to exactly grasp the ink end state in a visual manner, based on the presence/absence of ink in detection space 63 of detection tube 40.Type: ApplicationFiled: August 13, 2004Publication date: August 14, 2008Applicant: Mitsubishi Pencil Co., Ltd.Inventors: Atsushi Iwasa, Yukinori Sawa, Akira Fukai, Takahiro Osada
-
Patent number: 7101102Abstract: A capless writing instrument (1), wherein a writing element (5) is arranged inside a barrel cylinder (2) so that a pen point (6) of the writing element (5) can come out and retract through a front end opening of the barrel cylinder (2), is characterized in that an inner cap (20) formed of rubber or elastic resin is provided at the front end opening of the barrel cylinder (2), and the inner cap (20) is composed of: a closing portion (21) disposed on the pen point projecting side with respect to the axial direction of the barrel cylinder for closing the front end opening and having a slit (25) for allowing the pen point (6) to project and retract; and forward projected portions (27) that are projected from the outer periphery of the closing portion (21) toward the front end opening, and the inner cap is fitted inside the barrel cylinder so that, in the slit (25) closed state, force which is directed approximately perpendicular to the slit surfaces will act inward from the outer periphery of the forward projecteType: GrantFiled: September 5, 2003Date of Patent: September 5, 2006Assignee: Mitsubishi Pencil Co., Ltd.Inventor: Yukinori Sawa
-
Publication number: 20060002755Abstract: A capless writing instrument (1), wherein a writing element (5) is arranged inside a barrel cylinder (2) so that a pen point (6) of the writing element (5) can come out and retract through a front end opening of the barrel cylinder (2), is characterized in that an inner cap (20) formed of rubber or elastic resin is provided at the front end opening of the barrel cylinder (2), and the inner cap (20) is composed of: a closing portion (21) disposed on the pen point projecting side with respect to the axial direction of the barrel cylinder for closing the front end opening and having a slit (25) for allowing the pen point (6) to project and retract; and forward projected portions (27) that are projected from the outer periphery of the closing portion (21) toward the front end opening, and the inner cap is fitted inside the barrel cylinder so that, in the slit (25) closed state, force which is directed approximately perpendicular to the slit surfaces will act inward from the outer periphery of the forward projecteType: ApplicationFiled: September 5, 2003Publication date: January 5, 2006Applicant: Mitsubishi Pencil Co., Ltd.Inventor: Yukinori Sawa
-
Patent number: 6761496Abstract: A writing instrument equipped with an exchangeable inner pen filled with an ink containing a solvent having a vapor pressure of 1 to 50 mm Hg (20° C.) in a writing instrument main body which is a barrel part, wherein the inner pen described above has a pen tip comprising a fiber feeder or a plastic feeder, and the above pen tip is coated with a substance having a vaporization-inhibiting action in an amount of 0.01 to 20% by weight in terms of a weight ratio based on the pen tip. It is more effective to further add a substance having a vaporization-inhibiting action to the ink. The substance having a vaporization-inhibiting action includes glycerin derivatives, polyoxyethylenesorbit fatty acid esters, alkyl phosphates, waxes and lecithin.Type: GrantFiled: December 4, 2002Date of Patent: July 13, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventors: Takahiro Osada, Kazuhiro Ami, Yukinori Sawa
-
Publication number: 20030143017Abstract: A writing instrument equipped with an exchangeable inner pen filled with an ink containing a solvent having a vapor pressure of 1 to 50 mm Hg (20° C.) in a writing instrument main body which is a barrel part, wherein the inner pen described above has a pen tip comprising a fiber feeder or a plastic feeder, and the above pen tip is coated with a substance having a vaporization-inhibiting action in an amount of 0.01 to 20% by weight in terms of a weight ratio based on the pen tip. It is more effective to further add a substance having a vaporization-inhibiting action to the ink. The substance having a vaporization-inhibiting action includes glycerin derivatives, polyoxyethylenesorbit fatty acid esters, alkyl phosphates, waxes and lecithin.Type: ApplicationFiled: December 4, 2002Publication date: July 31, 2003Inventors: Takahiro Osada, Kazuhiro Ami, Yukinori Sawa
-
Patent number: 6478495Abstract: In a capless writing instrument with its writing element arranged in the barrel cylinder so that a writing point of the writing element can come out and retract through a front-end opening of the barrel cylinder, an inner cap having a dome-like convex portion projected frontwards is arranged at the front-end part of the barrel cylinder, and the inner cap is formed of rubber or elastic resin, a slit-forming groove having a thin-film portion at the depressed bottom of the slit is formed from a position at the root of the dome-like inner cap to the opposite position at the root intersecting the substantially center of the convex portion.Type: GrantFiled: March 11, 2002Date of Patent: November 12, 2002Assignee: Mitsubishi Pencil Kabushiki KaishaInventors: Kazuhiro Ami, Yukinori Sawa, Takahiro Osada
-
Publication number: 20020131807Abstract: In a capless writing instrument with its writing element arranged in the barrel cylinder so that a writing point of the writing element can come out and retract through a front-end opening of the barrel cylinder, an inner cap having a dome-like convex portion projected frontwards is arranged at the front-end part of the barrel cylinder, and the inner cap is formed of rubber or elastic resin, a slit-forming groove having a thin-film portion at the depressed bottom of the slit is formed from a position at the root of the dome-like inner cap to the opposite position at the root intersecting the substantially center of the convex portion.Type: ApplicationFiled: March 11, 2002Publication date: September 19, 2002Inventors: Kazuhiro Ami, Yukinori Sawa, Takahiro Osada