Granted Patent
Utility
US 4,238,672 · App. 05/869,495
Temperature control circuitry
Inventor:
Hans Siess
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Jan 16, 1978
Inventor
Hans Siess
Assignee (at issue)
Boderseewerk Perkin-Elmer & Co. GmbH
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.