Patents by Inventor Yutaka Kuroiwa
Yutaka Kuroiwa 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).
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Publication number: 20240150224Abstract: The present invention relates to a glass ceramic including: a lithium disilicate-based crystal; and an SiO2-based crystal, in which a content of the lithium disilicate-based crystal and a content of the SiO2-based crystal are both equal to or greater than a content of crystal other than the lithium disilicate-based crystal and the SiO2-based crystal on a mass basis.Type: ApplicationFiled: January 16, 2024Publication date: May 9, 2024Applicant: AGC Inc.Inventors: Kazuki KANEHARA, Yutaka KUROIWA, Shusaku AKIBA
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Publication number: 20240150225Abstract: The present invention relates to a glass ceramic, in which a crystal contained in the largest amount on a mass basis is a lithium disilicate-based crystal, and a ratio of Li ions in Li ion sites of the lithium disilicate-based crystal is less than 95%. The glass ceramic may have a light transmittance in terms of a thickness of 0.7 mm of 85% or more in a wavelength range of 400 nm to 1,000 nm.Type: ApplicationFiled: January 17, 2024Publication date: May 9, 2024Applicant: AGC Inc.Inventors: Kazuki KANEHARA, Yutaka KUROIWA, Shusaku AKIBA
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Publication number: 20240150226Abstract: The present invention relates to a glass ceramic, in which a crystal contained in the largest amount on a mass basis is a lithium disilicate-based crystal, and a difference obtained by subtracting a ratio (mass %) of a content of a crystal contained in the second largest amount on a mass basis from a ratio (mass %) of a content of the lithium disilicate-based crystal is 20 mass % or more.Type: ApplicationFiled: January 17, 2024Publication date: May 9, 2024Applicant: AGC Inc.Inventors: Kazuki KANEHARA, Yutaka KUROIWA, Shusaku AKIBA
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Publication number: 20240116800Abstract: A glass plate includes, in terms of molar percentage based on oxides: 70%?SiO2?85%; 0.0%?Al2O3?10%; 0.0%?B2O3?15%; 1.5%?MgO?20%; 0.0%?CaO?20%; 0.0% 0 SrO?5.0%; 0.0%?BaO?1.0%; 0.0% 0 ZnO?5.0%; 1.0%?Li2O?11%; 0.0%?Na2O?10%; 0.0% K2O?10%; 3.0%?R2O 11%; 0.01% Fe2O3?1.00%; and 2.0%?RO?20%, in which a temperature T2 at which a glass viscosity is 102 dPa·s is 1,650° C. or lower, a temperature T12 at which a glass viscosity is 1012 dPa·s is 730° C. or lower, a relative dielectric constant (Fr) at a frequency of 10 GHz is 6.5 or less, and a loss tangent (tan ?) at a frequency of 10 GHz is 0.0090 or less.Type: ApplicationFiled: December 18, 2023Publication date: April 11, 2024Applicant: AGC Inc.Inventors: Takato KAJIHARA, Shigeki SAWAMURA, Yutaka KUROIWA
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Publication number: 20240101467Abstract: The present invention relates to a photosensitive glass in which a Li2SiO3 crystal is precipitated by exposure and heat treatment, in which the photosensitive glass has a value of Formula (A) described below of 0.50 or more and 0.75 or less, and the photosensitive glass has a dielectric loss tangent at 20° C. and 10 GHz of 0.0090 or less, [Li2O]/([Li2O]+[Na2O]+[K2O]) Formula (A), in Formula (A), [Li2O], [Na2O], and [K2O] respectively indicate contents of Li2O, Na2O, and K2O in the photosensitive glass in terms of mole percentage based on oxides.Type: ApplicationFiled: November 28, 2023Publication date: March 28, 2024Applicant: AGC Inc.Inventors: Takeyuki KATO, Yutaka KUROIWA, Nobuo INUZUKA, Hirofumi YAMAMOTO
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Publication number: 20240098891Abstract: The present invention relates to a circuit board for a high-frequency device, including: a glass substrate in which a crystal is precipitated and cuttable by etching, and which has a dielectric loss tangent at 20° C. and 10 GHz of 0.0090 or less, and relates to a high-frequency device including the circuit board.Type: ApplicationFiled: November 28, 2023Publication date: March 21, 2024Applicant: AGC Inc.Inventors: Takeyuki KATO, Yutaka KUROIWA, Nobuo INUZUKA, Hirofumi YAMAMOTO
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Publication number: 20230348315Abstract: A glass plate includes, in terms of molar percentage based on oxides: 50% ? SiO2 ? 80%; 5.0% ? Al2O3 ? 10%; 5.0% < B2O3 ? 15%; 0.0% ? P2O5 ? 10%; 0.0% ? MgO ? 10%; 0.0% ? CaO ? 10%; 0.0% ? SrO ? 10%; 0.0% ? BaO ? 10%; 0.0% ? ZnO ? 5.0%; 0.0% ? Li2O ? 5.0%; 0.0% ? Na2O ? 5.0%; 0.0% ? K2O ? 5.0%; 0.0% ? R2O ? 5.0%; Fe2O3 ? 0.04%; 15% ? RO ? 30%; B2O3 - Al2O3 > 0.0%; and 0.30 < Al2O3/RO < 0.50, in which the glass plate has a temperature T12 at which a glass viscosity is 1012 dPa·s of 730° C. or lower, and the glass plate has an average thermal expansion coefficient at 50° C. to 350° C. of 40 × 10-7/K or more.Type: ApplicationFiled: June 8, 2023Publication date: November 2, 2023Applicant: AGC Inc.Inventors: Takato KAJIHARA, Shigeki SAWAMURA, Rikiya KADO, Yutaka KUROIWA, Shusaku AKIBA
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Publication number: 20230331622Abstract: A borosilicate glass includes, in terms of molar percentage based on oxides: 70.0%?SiO2?85.0%; 5.0%?B2O3?20.0%; 0.0%?Al2O3?3.0%; 0.0%?Li2O?5.0%; 0.0%?Na2O?5.0%; 0.0%?K2O?5.0%; 0.0%?MgO?5.0%; 0.0%?CaO?5.0%; 0.0%?SrO?5.0%; 0.0%?BaO?5.0%; and 0.06%?Fe2O3?1.0%, in which the borosilicate glass has a basicity of 0.485 or more, and [AlO3]/([SiO2]+[B2O3]) of 0.015 or less.Type: ApplicationFiled: June 8, 2023Publication date: October 19, 2023Applicant: AGC Inc.Inventors: Rikiya KADO, Takato KAJIHARA, Shigeki SAWAMURA, Shusaku AKIBA, Yutaka KUROIWA
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Publication number: 20230331620Abstract: To provide a glass plate for a window material and a window comprising the glass plate, which are less likely to be a barrier to radio transmitting/receiving in use of a radio-utilizing apparatus, and a radio communication apparatus comprising the glass plate. A glass plate having a radio transmittance of at least 20% at a frequency of 100 GHz as calculated as 18 mm thickness, a window comprising the glass plate, and a radio communication apparatus comprising the glass plate.Type: ApplicationFiled: March 13, 2023Publication date: October 19, 2023Applicant: AGC Inc.Inventors: Eriko Maeda, Takato Kajihara, Kensuke Nagai, Yutaka Kuroiwa, Osamu Kagaya, Ryuta Sonoda, Hiroyuki Hijiya
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Publication number: 20230322614Abstract: The present invention relates to a chemically strengthened glass having a thickness of t (unit: µm) and a relative permittivity of 7.0 or less at 20° C. and a frequency of 10 GHz, in which a value of Z determined by the following formula is 0.65 or more, where S1 is an entropy function calculated from an amount of alkali ions in a center portion of the glass, S2 is an entropy function calculated from an average amount of alkali ions from a glass surface to a depth of 0.05t, and X (unit: MPa) is an average value of a compressive stress in a region from the glass surface to the depth of 0.05t: Z = (S2 - S1) × 10 + X/1000.Type: ApplicationFiled: May 26, 2023Publication date: October 12, 2023Applicant: AGC Inc.Inventors: Kazuki KANEHARA, Yutaka KUROIWA
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Publication number: 20230212059Abstract: To provide a glass plate for a window material and a window comprising the glass plate, which are less likely to be a barrier to radio transmitting/receiving in use of a radio-utilizing apparatus, and a radio communication apparatus comprising the glass plate. A glass plate having a radio transmittance of at least 20% at a frequency of 100 GHz as calculated as 18 mm thickness, a window comprising the glass plate, and a radio communication apparatus comprising the glass plate.Type: ApplicationFiled: March 13, 2023Publication date: July 6, 2023Applicant: AGC Inc.Inventors: Eriko Maeda, Takato Kajihara, Kensuke Nagai, Yutaka Kuroiwa, Osamu Kagaya, Ryuta Sonoda, Hiroyuki Hijiya
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Publication number: 20230212062Abstract: The present invention relates to a crystallized glass including: at least one crystal of indialite and cordierite, in which the crystallized glass has a total amount of the crystal is 40 mass % or more of the crystallized glass, and the crystal comprises at least one of a vacancy and a different element at an Al site.Type: ApplicationFiled: March 15, 2023Publication date: July 6, 2023Applicant: AGC Inc.Inventors: Kazuki KANEHARA, Yutaka KUROIWA
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Publication number: 20230202907Abstract: An alkali-free glass includes, as represented by mol % based on oxides: 50 to 80% of SiO2; 2 to 6% of Al2O3; 18 to 35% of B2O3; 1 to 6% of MgO; 0 to 6% of CaO; 0 to 6% of SrO; and 0 to 3% of BaO. A formula (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the formula (A) is 2% or more and 6% or less. A formula (B) is [Al2O3]—([MgO]+[CaO]+[SrO]+[BaO]), and a value of the formula (B) is ?3% or more and 2% or less.Type: ApplicationFiled: February 23, 2023Publication date: June 29, 2023Applicant: AGC Inc.Inventors: Yusaku MATSUO, Hiroyuki HIJIYA, Yuya HAMADA, Yutaka KUROIWA
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Patent number: 11634353Abstract: To provide a glass plate for a window material and a window comprising the glass plate, which are less likely to be a barrier to radio transmitting/receiving in use of a radio-utilizing apparatus, and a radio communication apparatus comprising the glass plate. A glass plate having a radio transmittance of at least 20% at a frequency of 100 GHz as calculated as 18 mm thickness, a window comprising the glass plate, and a radio communication apparatus comprising the glass plate.Type: GrantFiled: October 2, 2019Date of Patent: April 25, 2023Assignee: AGC Inc.Inventors: Eriko Maeda, Takato Kajihara, Kensuke Nagai, Yutaka Kuroiwa, Osamu Kagaya, Ryuta Sonoda, Hiroyuki Hijiya
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Publication number: 20230120488Abstract: The present invention pertains to a laminated glass for a vehicle, the laminated glass including a first glass sheet, a second glass sheet and an intermediate film sandwiched between the first glass sheet and the second glass sheet, in which: the total thickness of the first glass sheet, the second glass sheet and the intermediate film is 4.0 mm or more; the first glass sheet is formed of a borosilicate glass containing, in terms of oxide by molar percentage, 1.0% or more of B2O3; and when a radio wave (TM wave) with a frequency of 79 [GHz] is made incident at an incident angle of 60° to the first glass sheet, the transmission property S21 is -4.0 [dB] or more.Type: ApplicationFiled: October 28, 2022Publication date: April 20, 2023Applicant: AGC Inc.Inventors: Takato KAJIHARA, Shigeki SAWAMURA, Shusaku AKIBA, Yutaka KUROIWA
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Publication number: 20230093194Abstract: A method for producing a high silicate glass substrate, includes: (1) obtaining a glass precursor containing, as represented by mol % based on oxides, 60% to 75% of SiO2, 0% to 15% of Al2O3, 15% to 30% of B2O3, 0% to 3% of P2O5, and 1% to 10% in total of at least one selected from R2O and R?O; (2) applying first heat treatment to the glass precursor to cause phase separation so as to obtain a phase-separated glass; (3) applying acid treatment to the phase-separated glass to make the phase-separated glass porous so as to obtain a porous glass; (4) drying the porous glass so that a rate of change in mass reaches 10% to 50%; and (5) applying second heat treatment to the porous glass to sinter the porous glass so as to obtain a high silicate glass substrate.Type: ApplicationFiled: November 30, 2022Publication date: March 23, 2023Applicant: AGC Inc.Inventors: Tomonori OGAWA, Yutaka KUROIWA, Kosho AKATSUKA, Hiroyuki HIJIYA
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Publication number: 20230082423Abstract: The present invention relates to a glass including, in terms of mole percentage based on oxides: 50.0 to 75.0% of SiO2; 7.5 to 25.0% of Al2O3; 0 to 25.0% of B2O3; 6.5 to 20.0% of Li2O; 1.5 to 10.0% of Na2O; 0 to 4.0% of K2O; 1.0 to 20.0% of MgO; one or more components selected from MgO, CaO, SrO, and BaO in a total amount of 1.0 to 20.0%; and 0 to 5.0% of TiO2, in which a value of Y calculated based on the following formula is 19.5 or less, Y=1.2×([MgO]+[CaO]+[SrO]+[BaO])+1.6×([Li2O]+[Na2O]+[K2O]), provided that [MgO], [CaO], [SrO], [BaO], [Li2O], [Na2O], and [K2O] are contents, in terms of mole percentage based on oxides, of components of MgO, CaO, SrO, BaO, Li2O, Na2O, and K2O respectively.Type: ApplicationFiled: November 9, 2022Publication date: March 16, 2023Applicant: AGC Inc.Inventors: Kazuki KANEHARA, Yutaka KUROIWA, Shusaku AKIBA, Hiroyuki HIJIYA
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Publication number: 20220363038Abstract: A laminated glass according to an embodiment of the present invention includes a first glass plate, a second glass plate, and an interlayer film held between the first glass plate and the second glass plate. When a relative dielectric constant of the first glass plate is represented by ?g1; a relative dielectric constant of the second glass plate is represented by ?g2; a relative dielectric constant of a first interlayer film provided in a first region of the interlayer film is represented by ?m1; a reflection coefficient at an interface between the first glass plate and the first interlayer film is represented by ?1; and a reflection coefficient at an interface between the second glass plate and the first interlayer film is represented by ?2, the reflection coefficients ?1 and ?2 satisfy relations 0.0??1?0.2 and 0.0??2?0.2.Type: ApplicationFiled: July 26, 2022Publication date: November 17, 2022Applicant: AGC Inc.Inventors: Nobutaka KIDERA, Kazuhiko NIWANO, Shoichi TAKEUCHI, Tetsuo ABE, Yutaka KUROIWA
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Publication number: 20220024803Abstract: A glass plate has a dielectric dissipation factor at 10 GHz of tan ?A and a glass transition temperature of Tg° C. The glass plate satisfies (tan ?100?tan ?A)?0.0004, where tan ?100 is a dielectric dissipation factor of the glass plate at 10 GHz after having been heated to (Tg+50)° C. and then cooled to (Tg?150)° C. at 100° C./min.Type: ApplicationFiled: October 4, 2021Publication date: January 27, 2022Applicant: AGC Inc.Inventors: Hiroyuki HIJIYA, Yutaka KUROIWA, Kazutaka ONO, Tomonori OGAWA, Yusaku MATSUO
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Patent number: 10865134Abstract: A wavelength-selective transmissive glass has a light transmittance Tmore than 315 nm and 400 nm or less at a wavelength of more than 315 nm and 400 nm or less represented by the formula shown below of 1% or more in terms of a plate thickness of 6 mm and a light transmittance T315 nm or less at a wavelength of 315 nm or less represented by the formula shown below of 60% or less in terms of a plate thickness of 6 mm. Ak is a weighting factor at a wavelength k (nm) for calculating T (light transmittance) defined in ISO-9050:2003, and Tk is a transmittance at the wavelength k (nm) in terms of a plate thickness of 6 mm: Tmore than 315 nm and 400 nm or less=(?k=more than 315400Ak×Tk)/(?k=more than 315400Ak) T315 nm or less=(?k=300315Ak×Tk)/(?k=300315Ak).Type: GrantFiled: June 1, 2018Date of Patent: December 15, 2020Assignees: AGC Inc., TSUBOTA LABORATORY, INC.Inventors: Kensuke Nagai, Tetsuya Nakashima, Yutaka Kuroiwa, Hiroyuki Hijiya, Masamichi Tanida, Akio Koike, Manabu Nishizawa, Kazuo Tsubota, Toshihide Kurihara, Hidemasa Torii