Granted Patent
Utility
US 5,692,491 · App. 08/639,852
Unglazed transpired solar collector having a low thermal-conductance absorber
Inventors:
Craig B. Christensen, Charles F. Kutscher, Keith Gawlik
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Apr 19, 1996
Inventors
Craig B. Christensen
Charles F. Kutscher
Keith Gawlik
Assignee (at issue)
Midwest Research Institute, 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.