Granted Patent
Utility
US 4,427,855 · App. 06/358,812
Pile-gap sensor, especially for deep-pile carpet
Inventor:
Johannes Freermann
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Mar 16, 1982
Inventor
Johannes Freermann
Assignee (at issue)
Carl Schmale GmbH & Co.
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.