Granted Patent
Utility
US 6,434,892 · App. 09/520,636
Overfilled, precast skewed arch bridge
Inventor:
Werner Heierli
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Mar 7, 2000
Inventor
Werner Heierli
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.