IP Library › Granted Patent US 4,423,675
Granted Patent Utility
US 4,423,675 · App. 06/355,982

Magnetic circuit and print hammer

Inventors: Zong S. Luo, Chor S. Chan
Patented Case View Patent ↗
Granted: Jan 3, 1984 Filed: Mar 8, 1982
Inventors
Zong S. Luo
Chor S. Chan
Assignee (at issue)
Hewlett-Packard Company, L.P.

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 4,423,675
App. No.
06/355,982
Filed
1982-03-08
Granted
1984-01-03
Kind
A