Granted Patent
Utility
US 4,382,446 · App. 06/199,738
Heat transfer devices for the scalp
Inventors:
Donald E. Truelock, Richard Turner
Patented Case
View Patent ↗
Granted: May 10, 1983
Filed: Oct 23, 1980
Inventors
Donald E. Truelock
Richard Turner
Assignee (at issue)
Kay Laboratories, 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.