Granted Patent
Utility
US 5,504,556 · App. 08/331,097
Electrostatic recording apparatus, method of controlling the apparatus, and method of evaluating life of photoconductive member of electrostatic recording apparatus
Inventors:
Takao Umeda, Toru Miyasaka, Osamu Namikawa, Isamu Komatsu
Patented Case
View Patent ↗
Granted: Apr 2, 1996
Filed: Oct 28, 1994
Inventors
Takao Umeda
Toru Miyasaka
Osamu Namikawa
Isamu Komatsu
Assignees (at issue)
HITACHI, LTD.
Hitachi Koki Co., Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.