Granted Patent
Utility
US 4,877,944 · App. 07/059,787
Self regulating heater
Inventors:
Mark J. Cowell, Kevin C. Ladd, Philip Scot Carter
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Jun 8, 1987
Inventors
Mark J. Cowell
Kevin C. Ladd
Philip Scot Carter
Assignee (at issue)
Metcal, 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.