IP Library › Granted Patent US 4,390,887
Granted Patent Utility
US 4,390,887 · App. 06/201,769

Electrographic recording stylus

Inventors: William R. Chynoweth, Roger D. Erickson
Patented Case View Patent ↗
Granted: Jun 28, 1983 Filed: Oct 29, 1980
Inventors
William R. Chynoweth
Roger D. Erickson
Assignee (at issue)
Honeywell Limited

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 4,390,887
App. No.
06/201,769
Filed
1980-10-29
Granted
1983-06-28
Kind
A