Granted Patent
Utility
US 6,820,384 · App. 09/691,934
Prefabricated foam block concrete forms and ties molded therein
Inventor:
Henry E. Pfeiffer
Patented Case
View Patent ↗
Granted: Nov 23, 2004
Filed: Oct 19, 2000
Inventor
Henry E. Pfeiffer
Assignee (at issue)
Reward Wall Systems, 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.