IP Library › Granted Patent US 4,225,222
Granted Patent Utility
US 4,225,222 · App. 05/952,066

Printing drum for an electrostatic imaging process with a doped amorphous silicon layer

Inventor: Karl Kempter
Patented Case View Patent ↗
Granted: Sep 30, 1980 Filed: Oct 17, 1978
Inventor
Karl Kempter
Assignee (at issue)
Siemens Aktiengesellschaft

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 4,225,222
App. No.
05/952,066
Filed
1978-10-17
Granted
1980-09-30
Kind
A