Patents Assigned to Dong-A Teaching Materials Co., Ltd.
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Patent number: 9228162Abstract: The present invention relates to a transparent solid cleaning agent that is convenient to carry because it has solid pen shape, and has no concern of contents flowing because it is a solid. According to one aspect of the invention, a transparent solid cleaning agent comprising 10 to 70 wt % of gel forming material including alkali metal salt or ammonium salt of C8-36 aliphatic carboxylic acid, 2 to 30 wt % of a transparency agent, 2 to 30 wt % of a subsidiary transparency agent, 0.1 to 10 wt % of orange oil, and 0.5 to 20 wt % of anionic surfactant is provided. The transparent solid cleaning agent according to the present invention is convenient to carry because it has a solid pen shape, has no concern of contents flowing because it is a solid, prevents collapse or bending, and has an excellent sense of beauty because the contents are transparent.Type: GrantFiled: November 1, 2013Date of Patent: January 5, 2016Assignee: DONG-A TEACHING MATERIALS CO., LTD.Inventors: Hak Jae Kim, Han Shin Jung
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Patent number: 9109298Abstract: Provided is a new-concept crystal growing ornament that may change in size due to a recrystallization phenomenon by supplying a growth liquid, thereby reducing repugnance or an artificial impression and arousing curiosity or interest. The crystal growing ornament includes a basic material made of a porous material and formed in a predetermined shape; a growth liquid formed to be absorbed into the basic material and evaporating after being absorbed into the basic material to generate a recrystallization phenomenon; a growth liquid supply unit connected to the basic material and formed to supply the growth liquid to the basic material after receiving the growth liquid; and a crystal growing body integrally formed outside the basic material due to the recrystallization phenomenon of the growth liquid.Type: GrantFiled: February 14, 2012Date of Patent: August 18, 2015Assignee: DONG-A TEACHING MATERIALS CO., LTD.Inventors: Hak-Jae Kim, Han-Shin Jung
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Patent number: 9074068Abstract: A bar type clay member for craft includes a body formed by heating and melting 50 wt % to 80 wt % of wax, adding 10 wt % to 40 wt % of body pigment and 1 wt % to 10 wt % of a colorant to the melted wax, and then melting and dispersing the body pigment and colorant in the wax, wherein the body has a thickness ranging from 0.3 mm to 10 mm and has a bar-like shape.Type: GrantFiled: January 4, 2011Date of Patent: July 7, 2015Assignee: DONG-A TEACHING MATERIALS CO., LTD.Inventors: Hak-Jae Kim, Han-Shin Jung, Ji Eun Lee
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Patent number: 9068079Abstract: Bar type clay for craft including 50 wt % to 80 wt % of wax, 10 wt % to 40 wt % of body pigment, and 1 wt % to 10 wt % of a colorant, and formed to have a bar-like shape is provided.Type: GrantFiled: January 5, 2011Date of Patent: June 30, 2015Assignee: DONG-A TEACHING MATERIALS CO., LTD.Inventors: Hak-Jae Kim, Han-Shin Jung, Ji Eun Lee
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Publication number: 20140135249Abstract: The present invention relates to a transparent solid cleaning agent that is convenient to carry because it has solid pen shape, and has no concern of contents flowing because it is a solid. According to one aspect of the invention, a transparent solid cleaning agent comprising 10 to 70 wt % of gel forming material including alkali metal salt or ammonium salt of C8-36 aliphatic carboxylic acid, 2 to 30 wt % of a transparency agent, 2 to 30 wt % of a subsidiary transparency agent, 0.1 to 10 wt % of orange oil, and 0.5 to 20 wt % of anionic surfactant is provided. The transparent solid cleaning agent according to the present invention is convenient to carry because it has a solid pen shape, has no concern of contents flowing because it is a solid, prevents collapse or bending, and has an excellent sense of beauty because the contents are transparent.Type: ApplicationFiled: November 1, 2013Publication date: May 15, 2014Applicant: Dong-A Teaching Materials Co., Ltd.Inventors: Hak Jae KIM, Han Shin JUNG
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Patent number: 8500353Abstract: A draw-out solid marker includes a cylindrical shell, a rotary member thread-fastened to the rear end of the shell; a movable member thread-fastened to the rotary member in the shell to move forward/backward from the shell by rotating the rotary member; a cylindrical solid core connected to the front of the movable member to move forward/backward with the movable member and having an elliptical, rectangular, or triangular cross-sectional shape; and a cap coupled to the front end of the shell in order to apply various patterns in accordance with the position of the front end.Type: GrantFiled: January 18, 2011Date of Patent: August 6, 2013Assignee: Dong-A Teaching Materials Co., Ltd.Inventor: Hak-Jae Kim
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Patent number: 8425675Abstract: A recrystallization type of ink composition comprises a solvent, a crystalline material, and a colorant. When the recrystallization type of ink composition is applied to a non-absorption surface such as a whiteboard, a glass surface, and a plastic surface, it is recrystallized to provide a visual effect of a metal sense at the applied part.Type: GrantFiled: June 9, 2010Date of Patent: April 23, 2013Assignee: Dong-A Teaching Materials Co., Ltd.Inventors: Chung Kyung Kim, Han-Shin Jung
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Publication number: 20120237413Abstract: Provided is a new-concept crystal growing ornament that may change in size due to a recrystallization phenomenon by supplying a growth liquid, thereby reducing repugnance or an artificial impression and arousing curiosity or interest. The crystal growing ornament includes a basic material made of a porous material and formed in a predetermined shape; a growth liquid formed to be absorbed into the basic material and evaporating after being absorbed into the basic material to generate a recrystallization phenomenon; a growth liquid supply unit connected to the basic material and formed to supply the growth liquid to the basic material after receiving the growth liquid; and a crystal growing body integrally formed outside the basic material due to the recrystallization phenomenon of the growth liquid.Type: ApplicationFiled: February 14, 2012Publication date: September 20, 2012Applicant: DONG-A TEACHING MATERIALS CO., LTDInventors: Hak-Jae KIM, Han-Shin JUNG
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Publication number: 20110303118Abstract: A recrystallization type of ink composition comprises a solvent, a crystalline material, and a colorant. When the recrystallization type of ink composition is applied to a non-absorption surface such as a whiteboard, a glass surface, and a plastic surface, it is recrystallized to provide a visual effect of a metal sense at the applied part.Type: ApplicationFiled: June 9, 2010Publication date: December 15, 2011Applicant: Dong-A Teaching Materials Co., Ltd.Inventors: Chung Kyung Kim, Han-shin Jung
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Publication number: 20110182650Abstract: Provided is a draw-out solid marker including: a cylindrical shell, a rotary member thread-fastened to the rear end of the shell; a movable member thread-fastened to the rotary member in the shell to move forward/backward from the shell by rotating the rotary member; a cylindrical solid core connected to the front of the movable member to move forward/backward with the movable member and having an elliptical, rectangular, or triangular cross-sectional shape; and a cap coupled to the front end of the shell in order to apply various patterns in accordance with the position of the front end.Type: ApplicationFiled: January 18, 2011Publication date: July 28, 2011Applicant: DONG-A TEACHING MATERIALS CO., LTD.Inventor: Hak-Jae KIM
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Publication number: 20110171470Abstract: A bar type clay member for craft includes a body formed by heating and melting 50 wt % to 80 wt % of wax, adding 10 wt % to 40 wt % of body pigment and 1 wt % to 10 wt % of a colorant to the melted wax, and then melting and dispersing the body pigment and colorant in the wax, wherein the body has a thickness ranging from 0.3 mm to 10 mm and has a bar-like shape.Type: ApplicationFiled: January 4, 2011Publication date: July 14, 2011Applicant: DONG-A TEACHING MATERIALS CO., LTD.Inventors: Hak-Jae KIM, Han-Shin Jung, Ji Eun Lee
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Publication number: 20110168054Abstract: Bar type clay for craft including 50 wt % to 80 wt % of wax, 10 wt % to 40 wt % of body pigment, and 1 wt % to 10 wt % of a colorant, and formed to have a bar-like shape is provided.Type: ApplicationFiled: January 5, 2011Publication date: July 14, 2011Applicant: DONG-A TEACHING MATERIALS CO., LTD.Inventors: Hak-Jae Kim, Han-Shin Jung, Ji Eun Lee
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Patent number: 7682437Abstract: There is provided a transparent solid marker that has high bending strength and low writing resistance as stick-formed goods, is difficult to break or bend, generates few remnants while coating is carried out, and does not cause spreading of a writing surface even if it is coated on a surface which is written on by oily or aqueous writing implements. There is provided a transparent solid marker that is obtained by heating and mixing a composition including a gel forming material that includes an alkali metal salt or ammonium salt of an aliphatic carboxylic acid having 8 to 36 carbon atoms, a transparency agent, a subsidiary transparency agent, hydrogenated glucose syrup, a basic pigment, and oil, and cooling it.Type: GrantFiled: May 21, 2009Date of Patent: March 23, 2010Assignee: Dong-A Teaching Materials Co., Ltd.Inventors: Hak-Jae Kim, Han-Shin Jung
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Publication number: 20090293767Abstract: There is provided a transparent solid marker that has high bending strength and low writing resistance as stick-formed goods, is difficult to break or bend, generates few remnants while coating is carried out, and does not cause spreading of a writing surface even if it is coated on a surface which is written on by oily or aqueous writing implements. There is provided a transparent solid marker that is obtained by heating and mixing a composition including a gel forming material that includes an alkali metal salt or ammonium salt of an aliphatic carboxylic acid having 8 to 36 carbon atoms, a transparency agent, a subsidiary transparency agent, hydrogenated glucose syrup, a basic pigment, and oil, and cooling it.Type: ApplicationFiled: May 21, 2009Publication date: December 3, 2009Applicant: DONG-A TEACHING MATERIALS CO., LTD.Inventors: HAK-JAE KIM, HAN-SHIN JUNG
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Patent number: 6612765Abstract: A core guide assembly for a stationery article includes a screw member with a predetermined length while externally bearing a male screw. A support member is connected to the one-sided end of the screw member while centrally bearing a support bar protruded opposite to the screw member. The support bar has a support protrusion with one or more portions bearing a large volume in the radial direction. The support protrusion is formed at the end portion of the support bar by one or two steps while bearing a shape of a cone or a disk, or arranged at the support bar by two or more steps in a zigzag while bearing a shape of a semi-cone or a semi-disk.Type: GrantFiled: November 13, 2001Date of Patent: September 2, 2003Assignee: Dong-A Teaching Materials Co., Ltd.Inventors: Sun-Hyung Lee, Byoung-Whoo Min
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Patent number: D813311Type: GrantFiled: June 16, 2016Date of Patent: March 20, 2018Assignee: DONG-A TEACHING MATERIALS CO., LTD.Inventor: Hakjae Kim