Granted Patent
Utility
US 5,771,707 · App. 08/786,130
Unitary heat exchanger for the air-to-air transfer of water vapor and sensible heat
Inventors:
Frederic Lagace, Daniel Forest
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Jan 17, 1997
Inventors
Frederic Lagace
Daniel Forest
Assignee (at issue)
Venmar Ventilation 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.