IP Library › Granted Patent US 5,881,456
Granted Patent Utility
US 5,881,456 · App. 08/821,163

Header tubes for heat exchangers and the methods used for their manufacture

Inventors: Michael E. Bergins, Peter Brede
Patented Case View Patent ↗
Granted: Mar 16, 1999 Filed: Mar 20, 1997
Inventors
Michael E. Bergins
Peter Brede
Assignee (at issue)
ARUP Alu-Rohr und Profil 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 5,881,456
App. No.
08/821,163
Filed
1997-03-20
Granted
1999-03-16
Kind
A