Granted Patent
Utility
US 5,076,821 · App. 07/645,249
Filter arrangement inserted in the intake airflow of a heating or air-conditioning system of a motor vehicle
Inventors:
Ulrich Bruhnke, Klaus Arold
Patented Case
View Patent ↗
Granted: Dec 31, 1991
Filed: Jan 24, 1991
Inventors
Ulrich Bruhnke
Klaus Arold
Assignee (at issue)
MERCEDES-BENZ GROUP AG
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.