Granted Patent
Utility
US 4,923,328 · App. 07/300,280
Maintainable expansion joint for highways, bridges and the like
Inventors:
David H. Arps, Howard R. Brown, Roy J. Lanham, Donald E. Weiker
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Jan 19, 1989
Inventors
David H. Arps
Howard R. Brown
Roy J. Lanham
Donald E. Weiker
Assignee (at issue)
The D.S. Brown Company
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.