Granted Patent
Utility
US 4,124,897 · App. 05/783,697
Compensation system for a magnetic compass
Inventor:
Willie E. Martin
Patented Case
View Patent ↗
Granted: Nov 7, 1978
Filed: Apr 1, 1977
Inventor
Willie E. Martin
Assignee (at issue)
E-Systems, 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.