Granted Patent
Utility
US 5,741,034 · App. 08/537,485
Electromagnetic door holder apparatus
Inventors:
Gurdev Bains, Hilario Costa
Patented Case
View Patent ↗
Granted: Apr 21, 1998
Filed: Oct 2, 1995
Inventors
Gurdev Bains
Hilario Costa
Assignee (at issue)
Federal Signal 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.