Patents by Inventor Takahiro Tuchiya

Takahiro Tuchiya 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: 5162849
    Abstract: An image forming apparatus which detects deterioration of developer contained in a developing unit, and if it is the case, the toner is discharged out of the developing unit through a surface of an image carrying member. The apparatus is provided with a sensor to measure toner concentration in developer contained in the developing unit, a drive controller to control a supply amount of toner into the developing unit based on the toner concentration, a calculating unit to obtain average toner supply during a predetermined period, a detecting unit to detect the deterioration of the developer by comparing the average toner supply with a reference data stored in a memory.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: November 10, 1992
    Assignee: Konica Corporation
    Inventors: Kunihisa Yoshino, Mitsuo Motohashi, Yukio Okamoto, Takahiro Tuchiya, Jun-ichi Hamada
  • Patent number: 4654113
    Abstract: A method of forming an insulating layer having a planar surf on a lower wiring layer having given patterns steps at the shoulders of the patterns. On a lower wiring layer, a lower insulating layer is formed and a heat resistive material is coated over the lower insulative layer to form a substantially a planar top surface and to fill cavities appearing in the surface of the lower insulating layer with the material. Then, etching is carried out to preserve the profile of the surface of the coating layer and to remove the coating layer at portions where through-holes are to be formed. Any cavities in the surface of the lower insulating layer remain filled with the material after etching. An upper insulating layer is deposited on the exposed lower insulating layer and the remaining part of the coating layer.
    Type: Grant
    Filed: February 6, 1985
    Date of Patent: March 31, 1987
    Assignee: Fujitsu Limited
    Inventors: Takahiro Tuchiya, Kazuaki Tukuda, Tadakazu Takada, Hiroshi Goto