IP Library › Granted Patent US 5,931,221
Granted Patent Utility
US 5,931,221 · App. 09/024,582

Heat exchanger

Inventors: Seiji Inoue, Kunihiko Nishishita, Fumio Ohkubo
Patented Case View Patent ↗
Granted: Aug 3, 1999 Filed: Feb 18, 1998
Inventors
Seiji Inoue
Kunihiko Nishishita
Fumio Ohkubo
Assignee (at issue)
Zexel GmbH

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 5,931,221
App. No.
09/024,582
Filed
1998-02-18
Granted
1999-08-03
Kind
A