Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA903303A
Inventor
Tanaka Hiroshi
Takahashi Shinkichi
Sato Toshihiko
Hasegawa Tetsuo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Publication date
Application grantedgrantedCritical
Publication of CA903303ApublicationCriticalpatent/CA903303A/en