Granted Patent
Utility
US 4,539,892 · App. 06/588,430
Hydraulic brake booster
Inventors:
John Edmund Mackiewicz, Jack Martinic
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Mar 12, 1984
Inventors
John Edmund Mackiewicz
Jack Martinic
Assignee (at issue)
ALLIED CONSULTING, 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.