Patents by Inventor Keiko Aita
Keiko Aita 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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Patent number: 11963454Abstract: To provide a piezoelectric body film that can suppress decrease in the piezoelectric constant d31, a method of producing a piezoelectric body film, and a piezoelectric body device. A piezoelectric body film comprising a fluororesin as a piezoelectric material, the fluororesin containing, as a main constituent unit, a repeating unit derived from vinylidene fluoride, a piezoelectric constant d31 of the piezoelectric body film being 20 pC/N or greater, and an extrapolated onset temperature at start of shrinkage determined by TMA measurement being not lower than 90° C. and not higher than 115° C. The difference between piezoelectric constants d31 measured before and after heating the piezoelectric body film at 100° C. for 24 hours relative to the piezoelectric constant d31 before the heating for 24 hours is 20% or less.Type: GrantFiled: October 19, 2018Date of Patent: April 16, 2024Assignee: KUREHA CORPORATIONInventors: Yusuke Sato, Hisaaki Terashima, Nobufumi Sato, Kazuyuki Kanno, Keiko Aita
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Publication number: 20230422627Abstract: To provide a piezoelectric body film that can suppress decrease in the piezoelectric constant d31, a method of producing a piezoelectric body film, and a piezoelectric body device. A piezoelectric body film comprising a fluororesin as a piezoelectric material, the fluororesin containing, as a main constituent unit, a repeating unit derived from vinylidene fluoride, a piezoelectric constant d31 of the piezoelectric body film being 20 pC/N or greater, and an extrapolated onset temperature at start of shrinkage determined by TMA measurement being not lower than 90° C. and not higher than 115° C. The difference between piezoelectric constants d31 measured before and after heating the piezoelectric body film at 100° C. for 24 hours relative to the piezoelectric constant d31 before the heating for 24 hours is 20% or less.Type: ApplicationFiled: September 11, 2023Publication date: December 28, 2023Applicant: Kureha CorporationInventors: Yusuke SATO, Hisaaki TERASHIMA, Nobufumi SATO, Kazuyuki KANNO, Keiko AITA
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Publication number: 20210367137Abstract: To provide a piezoelectric body film that can suppress decrease in the piezoelectric constant d31, a method of producing a piezoelectric body film, and a piezoelectric body device. A piezoelectric body film comprising a fluororesin as a piezoelectric material, the fluororesin containing, as a main constituent unit, a repeating unit derived from vinylidene fluoride, a piezoelectric constant d31 of the piezoelectric body film being 20 pC/N or greater, and an extrapolated onset temperature at start of shrinkage determined by TMA measurement being not lower than 90° C. and not higher than 115° C. The difference between piezoelectric constants d31 measured before and after heating the piezoelectric body film at 100° C. for 24 hours relative to the piezoelectric constant d31 before the heating for 24 hours is 20% or less.Type: ApplicationFiled: October 19, 2018Publication date: November 25, 2021Applicant: Kureha CorporationInventors: Yusuke SATO, Hisaaki TERASHIMA, Nobufumi SATO, Kazuyuki KANNO, Keiko AITA
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Patent number: 11136440Abstract: A vinylidene fluoride resin film is produced by using a film composition containing at least a vinylidene fluoride resin and organic particles. The vinylidene fluoride resin film includes a plurality of protrusions on at least one surface thereof. Among the plurality of protrusions, the number of protrusions greater than 0.10 ?m in height from a flat surface at which the protrusions are not present is from 40 to 400, per 0.10 mm2 of the vinylidene fluoride resin film.Type: GrantFiled: January 16, 2018Date of Patent: October 5, 2021Assignee: KUREHA CORPORATIONInventors: Nobufumi Sato, Kazuyuki Kanno, Yusuke Sato, Keiko Aita, Hisaaki Terashima
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Patent number: 10988586Abstract: Provided is a vinylidene fluoride resin film that is produced using a film composition including at least a vinylidene fluoride resin and inorganic particles; and that includes a plurality of protrusions on at least one surface thereof. Among the plurality of protrusions, the number of protrusions greater than 0.10 ?m in height from a flat surface at which the protrusions are not present is from 7.0 to 50 per 0.10 mm2 of the vinylidene fluoride resin film.Type: GrantFiled: January 16, 2018Date of Patent: April 27, 2021Assignee: KUREHA CORPORATIONInventors: Nobufumi Sato, Keiko Aita, Hisaaki Terashima, Kazuyuki Kanno, Yusuke Sato
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Publication number: 20190338091Abstract: Provided is a vinylidene fluoride resin film that is produced using a film composition including at least a vinylidene fluoride resin and inorganic particles; and that includes a plurality of protrusions on at least one surface thereof. Among the plurality of protrusions, the number of protrusions greater than 0.10 ?m in height from a flat surface at which the protrusions are not present is from 7.0 to 50 per 0.10 mm2 of the vinylidene fluoride resin film.Type: ApplicationFiled: January 16, 2018Publication date: November 7, 2019Inventors: Nobufumi SATO, Keiko AITA, Hisaaki TERASHIMA, Kazuyuki KANNO, Yusuke SATO
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Publication number: 20190330431Abstract: A vinylidene fluoride resin film is produced by using a film composition containing at least a vinylidene fluoride resin and organic particles. The vinylidene fluoride resin film includes a plurality of protrusions on at least one surface thereof. Among the plurality of protrusions, the number of protrusions greater than 0.10 ?m in height from a flat surface at which the protrusions are not present is from 40 to 400, per 0.Type: ApplicationFiled: January 16, 2018Publication date: October 31, 2019Inventors: Nobufumi SATO, Kazuyuki KANNO, Yusuke SATO, Keiko AITA, Hisaaki TERASHIMA
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Patent number: 7900961Abstract: An airbag has a front panel positioned on an occupant side when inflated, and a rear panel of substantially the same shape as the front panel positioned on an opposite side to the occupant. Furthermore, an inflation restricting section, which restricts the inflated shape of the airbag, is formed by drawing together and fixing a portion of the front panel. When the airbag is inflated, the occupant side of the airbag is pulled inwards, thereby forming a cavity on the occupant side.Type: GrantFiled: January 26, 2010Date of Patent: March 8, 2011Assignee: Autoliv Development ABInventors: Akifumi Hanawa, Shinobu Yamamoto, Yosuke Shimizu, Keiko Aita
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Patent number: 7866694Abstract: An airbag has a front panel positioned on an occupant side when inflated, and a rear panel of substantially the same shape as the front panel positioned on an opposite side to the occupant. Furthermore, an inflation restricting section, which restricts the inflated shape of the airbag, is formed by drawing together and fixing a portion of the front panel. When the airbag is inflated, the occupant side of the airbag is pulled inwards, thereby forming a cavity on the occupant side.Type: GrantFiled: January 13, 2010Date of Patent: January 11, 2011Assignee: Autoliv Development ABInventors: Akifumi Hanawa, Shinobu Yamamoto, Yosuke Shimizu, Keiko Aita
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Publication number: 20100117340Abstract: An airbag has a front panel positioned on an occupant side when inflated, and a rear panel of substantially the same shape as the front panel positioned on an opposite side to the occupant. Furthermore, an inflation restricting section, which restricts the inflated shape of the airbag, is formed by drawing together and fixing a portion of the front panel. When the airbag is inflated, the occupant side of the airbag is pulled inwards, thereby forming a cavity on the occupant side.Type: ApplicationFiled: January 26, 2010Publication date: May 13, 2010Inventors: Akifumi Hanawa, Shinobu Yamamoto, Yosuke Shimizu, Keiko Aita
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Publication number: 20100109301Abstract: An airbag has a front panel positioned on an occupant side when inflated, and a rear panel of substantially the same shape as the front panel positioned on an opposite side to the occupant. Furthermore, an inflation restricting section, which restricts the inflated shape of the airbag, is formed by drawing together and fixing a portion of the front panel. When the airbag is inflated, the occupant side of the airbag is pulled inwards, thereby forming a cavity on the occupant side.Type: ApplicationFiled: January 13, 2010Publication date: May 6, 2010Inventors: Akifumi Hanawa, Shinobu Yamamoto, Yosuke Shimizu, Keiko Aita
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Patent number: 7673901Abstract: An airbag has a front panel positioned on an occupant side when inflated, and a rear panel of substantially the same shape as the front panel positioned on an opposite side to the occupant. Furthermore, an inflation restricting section, which restricts the inflated shape of the airbag, is formed by drawing together and fixing a portion of the front panel. When the airbag is inflated, the occupant side of the airbag is pulled inwards, thereby forming a cavity on the occupant side.Type: GrantFiled: June 9, 2006Date of Patent: March 9, 2010Assignee: Autoliv Development ABInventors: Akifumi Hanawa, Shinobu Yamamoto, Yosuke Shimizu, Keiko Aita
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Publication number: 20060279072Abstract: An airbag has a front panel positioned on an occupant side when inflated, and a rear panel of substantially the same shape as the front panel positioned on an opposite side to the occupant. Furthermore, an inflation restricting section, which restricts the inflated shape of the airbag, is formed by drawing together and fixing a portion of the front panel. When the airbag is inflated, the occupant side of the airbag is pulled inwards, thereby forming a cavity on the occupant side.Type: ApplicationFiled: June 9, 2006Publication date: December 14, 2006Inventors: Akifumi Hanawa, Shinobu Yamamoto, Yosuke Shimizu, Keiko Aita