Granted Patent
Utility
US 4,933,535 · App. 07/311,705
Piecewise linear temperature controller utilizing pulse width modulation
Inventor:
John E. Zabinski
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Feb 15, 1989
Inventor
John E. Zabinski
Assignee (at issue)
Harper-Wyman Company
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.