Granted Patent
Utility
US 4,519,442 · App. 06/640,711
Heat exchange structure
Inventors:
Gordon L. Barna, James W. Lippert
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Aug 14, 1984
Inventors
Gordon L. Barna
James W. Lippert
Assignee (at issue)
Kaiser Aluminum & Chemical Corporation
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.