Granted Patent
Utility
US 5,774,828 · App. 08/844,628
Mapless GPS navigation system with user modifiable data base
Inventors:
Randall T. Brunts, Douglas L. Welk
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Apr 21, 1997
Inventors
Randall T. Brunts
Douglas L. Welk
Assignee (at issue)
DELCO ELECTRONICS CORPORATION
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.