Granted Patent
Utility
US 6,701,687 · App. 10/432,000
Modular wall block with mechanical course connector
Inventor:
Curtis W. Shillingburg
Patented Case
View Patent ↗
Granted: Mar 9, 2004
Filed: May 8, 2003
Inventor
Curtis W. Shillingburg
Assignee (at issue)
Ridgerock Retaining Walls, LLC
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.