Patents by Inventor Kensaku Fujii
Kensaku Fujii 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: 11970562Abstract: A phase difference film composed of a resin containing a copolymer including polymerization units A and B, the phase difference film including a cylindrical phase separation structure that generates a structural birefringence, the phase separation structure including a phase (A) having the polymerization unit A as a main component and a phase (B) having the polymerization unit B as a main component, and the phase difference film satisfying the following condition (1) or (2). Condition (1): D(A)>D(B) and f(B)>0.5, and a direction giving a maximum refractive index among in-plane directions and an orientation direction of a cylinder in the phase separation structure are parallel to each other. Condition (2): D(A)>D(B) and f(A)>0.5, and a direction giving a maximum refractive index among in-plane directions and an orientation direction of a cylinder in the phase separation structure are orthogonal to each other.Type: GrantFiled: March 18, 2019Date of Patent: April 30, 2024Assignee: ZEON CORPORATIONInventors: Takeshi Asada, Hironari Sudeji, Kensaku Fujii, Yusuke Yasu, Hiroya Nishioka
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Publication number: 20230241829Abstract: A method for producing a phase difference film is provided. The phase difference film includes an orientation layer formed of a resin C having a negative intrinsic birefringence value. The resin C contains a block copolymer having a block (A) including as a main component a polymerization unit A having a negative intrinsic birefringence value and a block (B) including as a main component a polymerization unit B, and a weight fraction of the block (A) therein being 50% by weight or more and 90% by weight or less. The phase difference film has an NZ factor of greater than 0 and smaller than 1. The method comprising: forming a single layer film of the resin C; and causing phase separation of the resin C in the film, which includes a step of applying to the film a stress along a thickness direction thereof.Type: ApplicationFiled: February 21, 2023Publication date: August 3, 2023Applicant: ZEON CORPORATIONInventors: Takeshi ASADA, Hironari SUDEJI, Kensaku FUJII
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Publication number: 20220033328Abstract: Provided is a method of purifying a monomer composition that contains a polycyclic aromatic vinyl compound including at least two monocycles selected from the group consisting of aromatic hydrocarbon monocycles and aromatic heteromonocycles. The purification method includes an impurity removal step of removing at least sulfur from the monomer composition.Type: ApplicationFiled: June 25, 2019Publication date: February 3, 2022Applicant: ZEON CORPORATIONInventors: Yusuke YASU, Kensaku FUJII
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Patent number: 11192976Abstract: The present invention provides: a copolymer (A) which is a copolymer obtained by copolymerizing one or plural cycloolefin monomers and one or plural acyclic olefin monomers, or a copolymer obtained by copolymerizing two or more cycloolefin monomers, wherein the glass transition temperature (Tg) of the copolymer is 100° C. or higher, the refractive index of the copolymer is 1.545 or higher, and the Abbe's number of the copolymer is 50 or larger, and at least one of the cycloolefin monomers is a deltacyclene.Type: GrantFiled: April 2, 2020Date of Patent: December 7, 2021Assignee: ZEON CORPORATIONInventors: Kensaku Fujii, Takashi Houkawa, Takuya Komatsubara, Yasuhiro Shimizu
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Publication number: 20210032396Abstract: A phase difference film composed of a resin C containing a copolymer P including a polymerization unit A and a polymerization unit B, the phase difference film including a lamellar phase separation structure that generates a structural birefringence, the phase separation structure including a phase (A) having the polymerization unit A as a main component and a phase (B) having the polymerization unit B as a main component, and the phase difference film satisfying the formulae (1A): f(A)>0.5 and (2):D(A)>D(B), or the formulae (1B): f(B)>0.5 and (2). f(A) represents a total weight ratio of the polymerization unit A in the copolymer P, f(B) represents a total weight ratio of the polymerization unit B in the copolymer P, D(A)=ReA(450)/ReA(550), D(B)=ReB(450)/ReB(550), and ReA(450), ReA(550), ReB(450) and ReB(550) are as defined in the description.Type: ApplicationFiled: March 18, 2019Publication date: February 4, 2021Applicant: ZEON CORPORATIONInventors: Takeshi ASADA, Hironari SUDEJI, Kensaku FUJII, Yusuke YASU, Hiroya NISHIOKA
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Publication number: 20210009744Abstract: A phase difference film composed of a resin containing a copolymer including polymerization units A and B, the phase difference film including a cylindrical phase separation structure that generates a structural birefringence, the phase separation structure including a phase (A) having the polymerization unit A as a main component and a phase (B) having the polymerization unit B as a main component, and the phase difference film satisfying the following condition (1) or (2). Condition (1): D(A)>D(B) and f(B)>0.5, and a direction giving a maximum refractive index among in-plane directions and an orientation direction of a cylinder in the phase separation structure are parallel to each other. Condition (2): D(A)>D(B) and f(A)>0.5, and a direction giving a maximum refractive index among in-plane directions and an orientation direction of a cylinder in the phase separation structure are orthogonal to each other.Type: ApplicationFiled: March 18, 2019Publication date: January 14, 2021Applicant: ZEON CORPORATIONInventors: Takeshi ASADA, Hironari SUDEJI, Kensaku FUJII, Yusuke YASU, Hiroya NISHIOKA
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Publication number: 20200231745Abstract: The present invention provides: a copolymer (A) which is a copolymer obtained by copolymerizing one or plural cycloolefin monomers and one or plural acyclic olefin monomers, or a copolymer obtained by copolymerizing two or more cycloolefin monomers, wherein the glass transition temperature (Tg) of the copolymer is 100° C. or higher, the refractive index of the copolymer is 1.545 or higher, and the Abbe's number of the copolymer is 50 or larger, and at least one of the cycloolefin monomers is a deltacyclene.Type: ApplicationFiled: April 2, 2020Publication date: July 23, 2020Applicant: ZEON CORPORATIONInventors: Kensaku FUJII, Takashi HOUKAWA, Takuya KOMATSUBARA, Yasuhiro SHIMIZU
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Publication number: 20200209452Abstract: A phase difference film including an orientation layer formed of a resin C having a negative intrinsic birefringence value, wherein the resin C contains a block copolymer having a block (A) including as a main component a polymerization unit A having a negative intrinsic birefringence value and a block (B) including as a main component a polymerization unit B, and a weight fraction of the block (A) therein being 50% by weight or more and 90% by weight or less, and the phase difference film has an NZ factor of greater than 0 and smaller than 1; and the production method thereof. Preferably, in the orientation layer, the resin C exhibits a phase separation structure, and a distance between phases in the phase separation structure is 200 nm or less.Type: ApplicationFiled: May 18, 2018Publication date: July 2, 2020Applicant: ZEON CORPORATIONInventors: Takeshi ASADA, Hironari SUDEJI, Kensaku FUJII
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Patent number: 10647811Abstract: The present invention provides: a copolymer (A) which is a copolymer obtained by copolymerizing one or plural cycloolefin monomers and one or plural acyclic olefin monomers, or by copolymerizing two or more cycloolefin monomers, wherein a glass transition temperature (Tg) is 100° C. or higher, a refractive index is 1.545 or higher, and an Abbe's number is 50 or larger; a polymer (B) selected from: a ring-opening homopolymer obtained by ring-opening polymerization of only a monomer represented by formula (I), a ring-opening copolymer obtained by ring-opening copolymerization of the monomer represented by formula (I) and a monomer capable of ring-opening copolymerization with the monomer represented by formula (I), a hydrogenated product of the ring-opening homopolymer and a hydrogenated product of the ring-opening copolymer; a forming material containing the copolymer (A) or the polymer (B); and a resin formed article obtained by forming the forming material.Type: GrantFiled: April 5, 2016Date of Patent: May 12, 2020Assignee: ZEON CORPORATIONInventors: Kensaku Fujii, Takashi Houkawa, Takuya Komatsubara, Yasuhiro Shimizu
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Publication number: 20180237634Abstract: The present invention provides a resin composition comprising an alicyclic-structure-containing polymer and a polyglyceride-based additive, wherein the polyglyceride-based additive includes one or a plurality of polyglyceride compounds, the polyglyceride-based additive has a hydroxyl value of 320 to 700 mgKOH/g, and the content of the polyglyceride-based additive is 0.2 to 2.0 parts by weight based on 100 parts by weight of the alicyclic-structure-containing polymer. The present invention also provides a resin formed article obtained by forming the resin composition. According to the present invention, a resin composition which hardly whitens even under a hot and humid environment and hardly causes a bleed-out phenomenon of additives, and a resin formed article obtained by forming the resin composition are provided.Type: ApplicationFiled: August 24, 2016Publication date: August 23, 2018Applicant: ZEON CORPORATIONInventors: Ayumi SATO, Kensaku FUJII, Akira FURUKO
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Publication number: 20180188420Abstract: The invention is a resin composition comprising an alicyclic-structure-containing polymer, a hindered-phenol-based antioxidant and a hindered amine compound, wherein the hindered-phenol-based antioxidant is a compound having a group represented by the specific formula, the hindered amine compound is a compound having a group represented by the specific formula in its molecule, a content of the hindered-phenol-based antioxidant is 0.1 to 2.0 parts by weight based on 100 parts by weight of the alicyclic-structure-containing polymer, and a content of the hindered amine compound is more than 0 to 1.0 part by weight based on 100 parts by weight of the alicyclic-structure-containing polymer, and a resin formed article, and an optical member. One aspect of the invention provides a resin composition which is hardly burned during forming, has excellent long-term thermal yellowing resistance and also suppresses adhesion of foreign matters due to charge, a resin formed article, and an optical member.Type: ApplicationFiled: March 30, 2016Publication date: July 5, 2018Applicant: ZEON CORPORATIONInventors: Akira FURUKO, Ayumi SATO, Taichi SAWAGUCHI, Kensaku FUJII, Takashi HOUKAWA
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Publication number: 20180086877Abstract: The present invention provides: a copolymer (A) which is a copolymer obtained by copolymerizing one or plural cycloolefin monomers and one or plural acyclic olefin monomers, or by copolymerizing two or more cycloolefin monomers, wherein a glass transition temperature (Tg) is 100° C. or higher, a refractive index is 1.545 or higher, and an Abbe's number is 50 or larger; a polymer (B) selected from: a ring-opening homopolymer obtained by ring-opening polymerization of only a monomer represented by formula (I), a ring-opening copolymer obtained by ring-opening copolymerization of the monomer represented by formula (I) and a monomer capable of ring-opening copolymerization with the monomer represented by formula (I), a hydrogenated product of the ring-opening homopolymer and a hydrogenated product of the ring-opening copolymer; a forming material containing the copolymer (A) or the polymer (B); and a resin formed article obtained by forming the forming material.Type: ApplicationFiled: April 5, 2016Publication date: March 29, 2018Applicant: ZEON CORPORATIONInventors: Kensaku FUJII, Takashi HOUKAWA, Takuya KOMATSUBARA, Yasuhiro SHIMIZU
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Patent number: 8584721Abstract: A tire having a rotation timing indication hole of the invention has a rotation timing indication hole comprising a multi-step hole provided in a tire tread, and respective steps of the hole have different contours from each other. Since the contour of the hole changes when the tire is worn, the rotation timing of the tire can be recognized.Type: GrantFiled: November 20, 2003Date of Patent: November 19, 2013Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Kensaku Fujii, Takehiko Murata
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Publication number: 20120279176Abstract: An object of the present invention is to provide a packaging material for heat sterilization treatment, in which a decrease in the oxygen absorption capacity until the time of a heat sterilization treatment is prevented, a sufficient oxygen absorption capacity is exhibited at the time of a heat sterilization treatment, and odor that is generated along with oxygen absorption is suppressed. To attain the object, the present invention provides a resin composition for a package to be subjected to heat sterilization, comprising an oxygen absorptive resin composition dispersed in an oxygen barriering matrix resin, wherein the oxygen absorptive resin composition comprises a conjugated diene polymer cyclized product, the oxygen absorptive resin composition has a glass transition temperature of 31° C. to 55° C., and the oxygen barriering matrix resin is at least one resin selected from an ethylene-vinyl alcohol copolymer resin and a polyamide resin.Type: ApplicationFiled: December 27, 2010Publication date: November 8, 2012Inventors: Shizuo Kitahara, Kensaku Fujii
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Patent number: 8180068Abstract: A noise eliminating apparatus includes a first microphone, a second microphone and a signal processing unit, the signal processing unit includes a linear prediction filter and a noise resynthesis filter, the linear prediction filter receives an output signal of the first microphone, predicts the output signal of the first microphone by linear prediction and generates a prediction signal, and the noise resynthesis filter is an adaptive filter which receives, as a main input signal, a first difference signal obtained by subtracting one of the output signal of the first microphone and the prediction signal from the other, receives, as an error signal, a second difference signal obtained by subtracting one of an output signal of the second microphone and an output signal of the noise resynthesis filter itself from the other, and updates a filter coefficient so that the error signal is minimized.Type: GrantFiled: March 7, 2006Date of Patent: May 15, 2012Assignee: TOA CorporationInventors: Kensaku Fujii, Satoshi Miyata
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Publication number: 20090214054Abstract: A noise eliminating apparatus includes a first microphone, a second microphone and a signal processing unit, the signal processing unit includes a linear prediction filter and a noise resynthesis filter, the linear prediction filter receives an output signal of the first microphone, predicts the output signal of the first microphone by linear prediction and generates a prediction signal, and the noise resynthesis filter is an adaptive filter which receives, as a main input signal, a first difference signal obtained by subtracting one of the output signal of the first microphone and the prediction signal from the other, receives, as an error signal, a second difference signal obtained by subtracting one of an output signal of the second microphone and an output signal of the noise resynthesis filter itself from the other, and updates a filter coefficient so that the error signal is minimized.Type: ApplicationFiled: March 7, 2006Publication date: August 27, 2009Applicant: TOA CORPORATIONInventors: Kensaku Fujii, Satoshi Miyata
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Publication number: 20050269003Abstract: A tire having a rotation timing indication hole of the invention has a rotation timing indication hole comprising a multi-step hole provided in a tire tread, and respective steps of the hole have different contours from each other. Since the contour of the hole changes when the tire is worn, the rotation timing of the tire can be recognized.Type: ApplicationFiled: November 20, 2003Publication date: December 8, 2005Inventors: Kensaku Fujii, Takehiko Murata
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Patent number: 6683960Abstract: An active noise control apparatus for transmitting, from a loud speaker, a secondary noise synthesized so as to have the same amplitude as and the opposite phase to a primary noise and for canceling the noise by acoustically overlapping the secondary noise. An overall system filter for simulating a characteristic of an overall system leading to an error detecting microphone from a noise detecting microphone is provided for the first and the second overall system filter. A second and a first noise control filter are connected to the first and the second overall system filter in cascade to form a noise control filter. A coefficient of an estimating noise transfer system filter, obtained when the difference between the differential output of both obtained when a white noise is applied to the circuit of cascade connections and the response difference of the first and the second overall system filter from a differential overall system filter becomes a minimum, is made the coefficient of the noise control filter.Type: GrantFiled: August 18, 2000Date of Patent: January 27, 2004Assignee: Fujitsu LimitedInventors: Kensaku Fujii, Juro Ohga
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Publication number: 20010021940Abstract: A method of updating reflection coefficients of a lattice filter is provided, which method includes the step of updating backward reflection coefficients by employing forward reflection coefficients which are updated so that a forward prediction error of a last stage of the lattice filter is minimized.Type: ApplicationFiled: January 23, 2001Publication date: September 13, 2001Applicant: FUJITSU LIMITEDInventors: Kensaku Fujii, Juro Ohga
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Patent number: 6256581Abstract: A navigation method for guiding a user from a present position to a destination position includes inputting the present position and the destination position, inputting data from a geographic database and a road network database and selecting a route from the present position to the destination position, determining particularity of route guide map according to the area and the density of data representing the selected route, selecting necessary data for guiding a user according to the particularity and generating the route guide map, inputting data corresponding to the area from a spatial object network database and generating route guide sentence with respect to the route guide map, and manipulating information in the route guide map and route guide sentence and outputting the manipulated information.Type: GrantFiled: July 28, 1999Date of Patent: July 3, 2001Assignee: Nippon Telegraph and Telephone CorporationInventors: Kensaku Fujii, Kazuhiro Sugiyama