Granted Patent
Utility
US 4,851,775 · App. 07/069,495
Digital compass and magnetometer having a sensor coil wound on a high permeability isotropic core
Inventors:
Nam Hun Kim, Timothy J. Hawks
Patented Case
View Patent ↗
Granted: Jul 25, 1989
Filed: Jul 2, 1987
Inventors
Nam Hun Kim
Timothy J. Hawks
Assignee (at issue)
Precision Navigation, 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.