Patents by Inventor Koichi Marumo

Koichi Marumo 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).

  • Data compression and decompression methods, data compression device, and data decompression device
    Patent number: 11876542
    Abstract: A compression apparatus performs processing of registering a symbol, which is input, in a predetermined entry among a plurality of entries in a case where the symbol is not registered in a first table having the plurality of entries and outputting the symbol and index data indicating non-compression, processing of outputting index data indicating compression and positional information indicating a position of the entry having the symbol registered therein and having a size smaller than a size of the symbol in a case where the symbol has been registered in the table, and processing of changing the size of the positional information depending on usage conditions of the plurality of entries.
    Type: Grant
    Filed: April 28, 2020
    Date of Patent: January 16, 2024
    Assignee: UNIVERSITY OF TSUKUBA
    Inventors: Shinichi Yamagiwa, Koichi Marumo, Eisaku Hayakawa
  • Data Compression and Decompression Methods, Data Compression Device, and Data Decompression Device
    Publication number: 20220239316
    Abstract: A compression apparatus performs processing of registering a symbol, which is input, in a predetermined entry among a plurality of entries in a case where the symbol is not registered in a first table having the plurality of entries and outputting the symbol and index data indicating non-compression, processing of outputting index data indicating compression and positional information indicating a position of the entry having the symbol registered therein and having a size smaller than a size of the symbol in a case where the symbol has been registered in the table, and processing of changing the size of the positional information depending on usage conditions of the plurality of entries.
    Type: Application
    Filed: April 28, 2020
    Publication date: July 28, 2022
    Inventors: Shinichi Yamagiwa, Koichi Marumo, Eisaku Hayakawa
  • Data compressor, data decompressor, and data compression/decompression system
    Patent number: 11196443
    Abstract: A technique to prevent a retrieving process of a conversion rule from taking a longer time is provided.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: December 7, 2021
    Assignee: UNIVERSITY OF TSUKUBA
    Inventors: Shinichi Yamagiwa, Koichi Marumo, Ryuta Morita
  • DATA COMPRESSOR, DATA DECOMPRESSOR, AND DATA COMPRESSION/DECOMPRESSION SYSTEM
    Publication number: 20210258020
    Abstract: A technique to prevent a retrieving process of a conversion rule from taking a longer time is provided.
    Type: Application
    Filed: August 22, 2019
    Publication date: August 19, 2021
    Inventors: Shinichi Yamagiwa, Koichi Marumo, Ryuta Morita