Granted Patent
Utility
US 4,294,227 · App. 06/047,548
Apparatus for heating water by solar heat
Inventors:
Ursula Kreibich, Rolf Schmid
Patented Case
View Patent ↗
Granted: Oct 13, 1981
Filed: Jun 11, 1979
Inventors
Ursula Kreibich
Rolf Schmid
Assignee (at issue)
Ciba-Geigy
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.