IP Library › Granted Patent US 4,248,526
Granted Patent Utility
US 4,248,526 · App. 06/001,056

Circuit for detecting door state in copying apparatus

Inventors: Abe Shunichi, Mistuo Akiyama
Patented Case View Patent ↗
Granted: Feb 3, 1981 Filed: Jan 5, 1979
Inventors
Abe Shunichi
Mistuo Akiyama
Assignee (at issue)
Konishiroku Photo Industry 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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,248,526
App. No.
06/001,056
Filed
1979-01-05
Granted
1981-02-03
Kind
A