Granted Patent
Utility
US 5,642,253 · App. 08/509,380
Multi-channel ignition coil driver module
Inventor:
John Robert Shreve
Patented Case
View Patent ↗
Granted: Jun 24, 1997
Filed: Jul 31, 1995
Inventor
John Robert Shreve
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.