Granted Patent
Utility
US 5,056,594 · App. 07/563,163
Wavy heat transfer surface
Inventor:
Michael Kraay
Patented Case
View Patent ↗
Granted: Oct 15, 1991
Filed: Aug 3, 1990
Inventor
Michael Kraay
Assignee (at issue)
American Standard Inc.
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.