Patents by Inventor Mitsuru SEKIZAWA

Mitsuru SEKIZAWA 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).

  • Air conditioning system
    Patent number: 12085308
    Abstract: An air conditioning system includes a first unit and a second unit. The space above the ceiling of each of a plurality of clean rooms is included in the chamber as a single space common to a plurality of the clean rooms. The first clean room is higher than the second clean room in air cleanliness.
    Type: Grant
    Filed: March 24, 2023
    Date of Patent: September 10, 2024
    Assignee: Hitachi Global Life Solutions, Inc.
    Inventors: Mitsuru Sekizawa, Yuuiti Sato, Kazuhito Matsuzaki
  • Air Conditioning System
    Publication number: 20230228433
    Abstract: An air conditioning system includes a first unit and a second unit. The space above the ceiling of each of a plurality of clean rooms is included in the chamber as a single space common to a plurality of the clean rooms. The first clean room is higher than the second clean room in air cleanliness.
    Type: Application
    Filed: March 24, 2023
    Publication date: July 20, 2023
    Inventors: Mitsuru SEKIZAWA, Yuuiti SATO, Kazuhito MATSUZAKI
  • Air conditioning system
    Patent number: 11649975
    Abstract: Provided is an air conditioning system that maintains a room pressure in a clean room at high accuracy while having a simple configuration. An air conditioning system includes: a fan filter unit including a supply air fan to supply air to a preparation room from a chamber including space above a ceiling of the preparation room; a fan filter unit including a supply air fan to supply the air to the preparation room from the chamber; and a fan filter unit including a return air fan to return the air from the preparation room through the chamber and to exhaust the air from the preparation room, and further includes: a pressure sensor provided in the preparation room; and a control unit to control a return air fan based on a value detected by the pressure sensor.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: May 16, 2023
    Assignee: Hitachi Global Life Solutions, Inc.
    Inventors: Mitsuru Sekizawa, Yuuiti Sato, Kazuhito Matsuzaki
  • Air Conditioning System
    Publication number: 20220349594
    Abstract: Provided is an air conditioning system that maintains a room pressure in a clean room at high accuracy while having a simple configuration. An air conditioning system includes: a fan filter unit including a supply air fan to supply air to a preparation room from a chamber including space above a ceiling of the preparation room; a fan filter unit including a supply air fan to supply the air to the preparation room from the chamber; and a fan filter unit including a return air fan to return the air from the preparation room through the chamber and to exhaust the air from the preparation room, and further includes: a pressure sensor provided in the preparation room; and a control unit to control a return air fan based on a value detected by the pressure sensor.
    Type: Application
    Filed: December 4, 2019
    Publication date: November 3, 2022
    Inventors: Mitsuru SEKIZAWA, Yuuiti SATO, Kazuhito MATSUZAKI