Patents by Inventor Masahiro Tomisato

Masahiro Tomisato 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: 4658379
    Abstract: A semiconductor memory device with a laser programmable redundancy circuit, which includes: a plurality of decoders for selecting a row or column of the memory; at least one spare decoder which is selected instead of a decoder connected to a faulty memory cell; a link element inserted in series with the precharging transistor and connected between the power supply and the decoder output line; a signal generator which generates a non-selection signal for making the object decoder unselected only when a spare decoder is selected, the signal generator being provided in the spare decoder; and a transistor, having a gate to which the non-selection signal is input, with the drain and the source thereof being connected to the decoder output and ground, respectively, the transistor being provided in the decoder.
    Type: Grant
    Filed: October 30, 1984
    Date of Patent: April 14, 1987
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuyasu Fujishima, Kazuhiro Shimotori, Hideyuki Ozaki, Hideshi Miyatake, Masahiro Tomisato