Granted Patent
Utility
US 4,970,523 · App. 07/328,870
Differential doppler velocity GPS receiver
Inventors:
Paul Braisted, Ralph F. Eschenbach
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Mar 27, 1989
Inventors
Paul Braisted
Ralph F. Eschenbach
Assignee (at issue)
Trimble Navigation Limited
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.