Patents by Inventor Masahiko Mizutani

Masahiko Mizutani 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: 10428004
    Abstract: It is intended to provide a method capable of suppressing distillation apparatus corrosion as a method for producing acetic acid, comprising the step of distilling a crude acetic acid solution containing acetic acid and an impurity having a higher boiling point than that of acetic acid to purify the acetic acid. The method for producing acetic acid of the present invention comprises the step described above, wherein the distillation of the crude acetic acid solution is performed under a condition involving a distillation column bottom temperature of not more than 165° C. An acetic acid concentration in the crude acetic acid solution to be subjected to the distillation is preferably not less than 90 mass %. Examples of the impurity having a higher boiling point than that of acetic acid include acetate salts, acetic anhydride, and propionic acid. A column bottom pressure of the distillation column is preferably less than 0.255 MPaG.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: October 1, 2019
    Assignee: DAICEL CORPORATION
    Inventors: Masahiko Shimizu, Yoshihisa Mizutani
  • Publication number: 20190263744
    Abstract: A process for producing acetic acid comprises a process comprising: (1) carbonylating methanol; (2) separating the reaction mixture into a volatile phase and a less-volatile phase; (3) distilling the volatile phase to forma first overhead rich in a lower boiling component, and an acetic acid stream rich in acetic acid; and at least one step group selected from the group consisting of the following sections (4), (9), and (15): (4) a section for separating impurities from the acetic acid stream to give purified acetic acid, (9) a section for separating the first overhead into a stream rich in acetaldehyde and a stream rich in methyl iodide, and (15) a section for absorption-treating an off-gas from the process with an absorption solvent and forming a carbon monoxide-rich stream and an acetic acid-rich stream.
    Type: Application
    Filed: February 1, 2019
    Publication date: August 29, 2019
    Applicant: Daicel Corporation
    Inventors: Masahiko SHIMIZU, Yoshihisa MIZUTANI, Hiroyuki MIURA
  • Publication number: 20190151769
    Abstract: A process for separating or removing permanganate reducing compounds (PRC's) from a first mixture containing at least one PRC, methyl iodide, and water comprises the steps of: feeding the first mixture to a feed port of a distillation column, and distilling and separating the first mixture into an upper stream and a lower stream, wherein the distillation of the first mixture forms a second mixture at an upper position than the feed port, and the process further comprises the steps of: withdrawing the second mixture as the upper stream, and withdrawing the lower stream from a lower position than the feed port.
    Type: Application
    Filed: November 16, 2018
    Publication date: May 23, 2019
    Applicant: Daicel Corporation
    Inventors: Masahiko SHIMIZU, Yoshihisa MIZUTANI, Hiroyuki MIURA
  • Patent number: 9407389
    Abstract: In an extensive distribution system with no delay guarantee network used as a relay network, an influence of a fluctuation of a communication delay time is avoided to conduct a high-precision time synchronization. First and second delay control devices installed in junctions between communication networks and a relay network, respectively, have functions of retaining first and second time information, and setting a first relay network passing time of a first communication signal directed from a time dissemination device toward a time receiving device through a relay network, and a second relay network passing time of a second communication signal directed from the time receiving device toward the time dissemination device, respectively. In measurement of communication delay time of the first communication network and the second communication network prior to time synchronization, the first and second relay network passing times are unified in advance to exclude uncertainty of the communication time.
    Type: Grant
    Filed: August 7, 2014
    Date of Patent: August 2, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Mizutani, Hiroaki Nakazawa, Yoshihiro Ashi, Daiji Mitsunaga, Hideyuki Nakanishi
  • Patent number: 9379877
    Abstract: A transmission device uses transmission delay time of reciprocation with the terminal and time information of the transmission device to create a correction value of time information of the terminal and transmits it to the terminal. The terminal includes expected arrival time information based on the time information of the terminal and the correction value received from the transmission device in a frame transmitted to the transmission device. The transmission device compares reception time of the frame with the expected arrival time information in the frame. If they match, the time information of the terminal synchronizes with the time information of the transmission device. If they do not match, the transmission device transmits a new correction value to the terminal. The terminal transmits a frame including expected arrival time information using the new correction value to the transmission device.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: June 28, 2016
    Assignee: HITACHI, LTD.
    Inventors: Masahiko Mizutani, Yoshihiro Ashi
  • Patent number: 9350746
    Abstract: A transmission network system includes a network terminating device connected to a user terminal and an authentication information device connected to the network terminating device through a transmission network. The transmission network is connected to a reference clock that holds a reference time. The network terminating device includes a terminating internal clock that synchronizes with the reference clock, when receiving a first frame from the user terminal, generates a second frame including a time outputted from the terminating internal clock as a request time on the basis of the first frame, and transmits the second frame to the authentication information device. The authentication information device generates time authentication information based on the request time included in the received second frame, generates a third frame including the generated time authentication information, and transmits the third frame to the transmission network.
    Type: Grant
    Filed: January 23, 2014
    Date of Patent: May 24, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Shinya Fujioka, Yoshihiro Ashi, Masahiko Mizutani
  • Patent number: 9166874
    Abstract: A redundant path configuration method and a control method are disclosed. An intercommunication path for mutually transmitting and receiving a signal is provided among the BHEs each of which is a top of a tree. When failures occur in an active system path in certain AE, a standby system path (BHE) relays communication between the AE and the (active system) BHE so as to secure continuity of communication. The intercommunication path through which a data signal does not flow in a normal operation is used as a traffic accommodation path in an emergency among the BHEs. By setting a bypass between the tops of the trees, when a failure occurs in one tree, a signal is transferred from the active system BHE to the standby system path in which another BHE is a top to build a sub-tree bypassing the failure point and to secure a communication path.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: October 20, 2015
    Assignee: HITACHI, LTD.
    Inventor: Masahiko Mizutani
  • Publication number: 20150103643
    Abstract: A transmission network is comprised of a network management system for collectively managing and controlling a plurality of transmission devices coupled mutually through transmission routes and the transmission network as well. The network management system includes a plane management table adapted to manage transmission planes defined as a set of paths in the transmission network, and the plane management table has the function to set and manage a transmission plane (working plane) applied during normal operation and besides, a single or a plurality of transmission planes (protection planes) applicable in the event of occurrence of a fault in the transmission network. Then, when a fault occurs in the transmission network, the network management system changes the applied plane to a suitable transmission plane.
    Type: Application
    Filed: December 18, 2014
    Publication date: April 16, 2015
    Applicant: Hitachi, Ltd.
    Inventors: SHINYA FUJIOKA, Yoshihiro ASHI, Masahiko MIZUTANI, Hideki ENDO
  • Publication number: 20150085852
    Abstract: In an extensive distribution system with no delay guarantee network used as a relay network, an influence of a fluctuation of a communication delay time is avoided to conduct a high-precision time synchronization. First and second delay control devices installed in junctions between communication networks and a relay network, respectively, have functions of retaining first and second time information, and setting a first relay network passing time of a first communication signal directed from a time dissemination device toward a time receiving device through a relay network, and a second relay network passing time of a second communication signal directed from the time receiving device toward the time dissemination device, respectively. In measurement of communication delay time of the first communication network and the second communication network prior to time synchronization, the first and second relay network passing times are unified in advance to exclude uncertainty of the communication time.
    Type: Application
    Filed: August 7, 2014
    Publication date: March 26, 2015
    Applicant: HITACHI, LTD.
    Inventors: Masahiko MIZUTANI, Hiroaki NAKAZAWA, Yoshihiro ASHI, Daiji MITSUNAGA, Hideyuki NAKANISHI
  • Patent number: 8864231
    Abstract: A bearing assembly for a worm drive supporting the worm of the worm drive with washer-shaped thrust slide bearings and bush-shaped radial slide (sintered oil-containing bearings) bearings. The thrust slide bearings are made of a resin containing 95 to 99.9 wt % of polyetheretherketone resin, which is an aromatic polyetherketone resin. Wear of the thrust slide bearings is reduced and its durability is improved, thereby preventing vibration and noise of the worm drive as well as improving its durability.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: October 21, 2014
    Assignee: NTN Corporation
    Inventors: Masato Shimoda, Masahiko Mizutani
  • Patent number: 8824894
    Abstract: When an ONU accommodating range is enlarged, and ONUs shorter and ONUs longer in a communication path to an OLT are accommodated in a PON at the same time, there is a need to change a light intensity at the time of transmitting a downstream signal in order that both of the ONUs receive a downstream signal from the OLT. When a near-end ONU receives a signal having a light intensity necessary to communicate between the OLT and a far-end ONU, there arises such a problem that the light intensity is as high as an ONU receiver fails. In order to eliminate the ONU failure of the above problem, prior to transmission of the downstream signal, a downstream signal transmission schedule (downstream light intensity map) is notified to all of the ONUs. An optical transceiver of the OLT has a function of adjusting an output light intensity, and adjusts the light intensity to values receivable by the individual ONUs when the signal arrives at the respective ONUs according to route distances to the respective ONUs.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: September 2, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Masao Niibe, Masahiko Mizutani
  • Publication number: 20140215566
    Abstract: A transmission network system includes a network terminating device connected to a user terminal and an authentication information device connected to the network terminating device through a transmission network. The transmission network is connected to a reference clock that holds a reference time. The network terminating device includes a terminating internal clock that synchronizes with the reference clock, when receiving a first frame from the user terminal, generates a second frame including a time outputted from the terminating internal clock as a request time on the basis of the first frame, and transmits the second frame to the authentication information device. The authentication information device generates time authentication information based on the request time included in the received second frame, generates a third frame including the generated time authentication information, and transmits the third frame to the transmission network.
    Type: Application
    Filed: January 23, 2014
    Publication date: July 31, 2014
    Inventors: Shinya FUJIOKA, Yoshihiro ASHI, Masahiko MIZUTANI
  • Patent number: 8667058
    Abstract: When data is disclosed to a plurality of users by using a transfer network and a transfer apparatus, data disclosure time control which cannot be adversely affected by the users is performed to reduce the difference in data disclosure time among the users. A transfer network system includes a distribution server serving as a data-distribution-source transfer apparatus, and a network terminal connected to distribution-destination user equipment. The distribution server and the network terminal each have a time keeping function and a time synchronization function for matching the time of the time keeping function with a master clock. The distribution server sends in advance disclosure data and disclosure time to the network terminal. When the time of the time keeping function of the network terminal matches the disclosure time, the network terminal sends the disclosure data to the user equipment.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: March 4, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Shinya Fujioka, Yoshihiro Ashi, Masahiko Mizutani
  • Publication number: 20140050078
    Abstract: In a redundant packet communication path including an active path and a backup path, user data that flows into the active path during a time when switching from the active path to the backup path is completed is transferred to a device at a protection zone receiving end to reduce a communication interruption time (traffic suspension time) in a user's point of view.
    Type: Application
    Filed: March 7, 2013
    Publication date: February 20, 2014
    Applicant: HITACHI, LTD.
    Inventors: Aya SATO, Masahiko MIZUTANI, Masao NIIBE, Katsuyoshi SUZUKI
  • Patent number: 8654766
    Abstract: An interconnection between fully synchronous networks and next-generation frame communications networks is disclosed. A means of bidirectional frame format conversion between a synchronous multiplexing system and a logical multiplexing system is provided, along with a method of transmitting data between different networks on a path as if it were being transmitted in the same network. Further, when converting network control information in an STM network into data suitable for a packet network, even across the boundary of a synchronous multiplexing system and a logical multiplexing system, a unified communication management means is provided over the whole path.
    Type: Grant
    Filed: May 7, 2012
    Date of Patent: February 18, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Mizutani, Yoshihiro Ashi, Masayuki Takase, Atsushi Iwamura, Akihiko Tanaka, Hideki Endo, Tohru Kazawa
  • Patent number: 8554075
    Abstract: Switching process at the occurrence of a path trouble is performed more quickly to reduce the number of packet discards during a traffic transition from a currently used system path to a standby system path within a section to be protected. An OLT (210-W) refers to the DBA information of a PON section and, if receiving no CCM frame at a timing at which the same should be received, then determines that some trouble has occurred on the path (S801) and transmits, to an OAM-compliant NE (200-Z), an application-for-switching frame (1501) to notify the OAM-compliant NE (200-Z) of the abnormal condition. The OAM-compliant NE (200-Z) monitors the occurrence of the trouble within the PON section nearly in real time, starts a switching process (S802) and generates and transmits a standby-system delivery request (321) (S302, S803). An OAM-compliant NE (200-A) switches the communication path to the standby-system passing through an OLT (210-P).
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: October 8, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Mizutani, Yusuke Yajima, Nobuyuki Yamamoto, Yoshihiro Ashi
  • Publication number: 20130258842
    Abstract: A redundant path configuration method and a control method are disclosed. An intercommunication path for mutually transmitting and receiving a signal is provided among the BHEs each of which is a top of a tree. When failures occur in an active system path in certain AE, a standby system path (BHE) relays communication between the AE and the (active system) BHE so as to secure continuity of communication. The intercommunication path through which a data signal does not flow in a normal operation is used as a traffic accommodation path in an emergency among the BHEs. By setting a bypass between the tops of the trees, when a failure occurs in one tree, a signal is transferred from the active system BHE to the standby system path in which another BHE is a top to build a sub-tree bypassing the failure point and to secure a communication path.
    Type: Application
    Filed: October 28, 2011
    Publication date: October 3, 2013
    Applicant: HITACHI, LTD..
    Inventor: Masahiko Mizutani
  • Publication number: 20130182559
    Abstract: A transmission network is comprised of a network management system for collectively managing and controlling a plurality of transmission devices coupled mutually through transmission routes and the transmission network as well. The network management system includes a plane management table adapted to manage transmission planes defined as a set of paths in the transmission network, and the plane management table has the function to set and manage a transmission plane (working plane) applied during normal operation and besides, a single or a plurality of transmission planes (protection planes) applicable in the event of occurrence of a fault in the transmission network. Then, when a fault occurs in the transmission network, the network management system changes the applied plane to a suitable transmission plane.
    Type: Application
    Filed: July 19, 2012
    Publication date: July 18, 2013
    Inventors: Shinya Fujioka, Yoshihiro Ashi, Masahiko Mizutani, Hideki Endo
  • Patent number: 8488965
    Abstract: It is necessary to completely remove overlapping of signals between plural PONs in order to make the PONs coexist. Accordingly, it is required to share or intensively manage bandwidth use conditions over an optical fiber that serves as a common band between plural systems. Therefore, transmission clocks should be synchronized with high accuracy between plural systems. A reference clock is provided from an external device or a representative OLT to the entire systems to perform clock synchronization between plural systems, so that the overall systems are synchronized by synchronizing each OLT with the reference clock. A hierarchical management method is selected that manages ONUs under the control of each OLT by managing band use information arranged for each OLT with respect to an external device or a representative OLT for sharing of bandwidth use conditions between plural systems.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: July 16, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Mizutani, Toshiki Sugawara, Hiroki Ikeda
  • Patent number: 8457495
    Abstract: It is necessary to completely remove overlapping of signals between plural PONs in order to make the PONs coexist. Accordingly, it is required to share or intensively manage bandwidth use conditions over an optical fiber that serves as a common band between plural systems. Therefore, transmission clocks should be synchronized with high accuracy between plural systems. A reference clock is provided from an external device or a representative OLT to the entire systems to perform clock synchronization between plural systems, so that the overall systems are synchronized by synchronizing each OLT with the reference clock. A hierarchical management method is selected that manages ONUs under the control of each OLT by managing band use information arranged for each OLT with respect to an external device or a representative OLT for sharing of bandwidth use conditions between plural systems.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: June 4, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Mizutani, Toshiki Sugawara, Hiroki Ikeda