Granted Patent
Utility
US 6,564,520 · App. 09/869,821
Sheet-like masonry block drainage system
Inventors:
Donald A. Starke, John A. Striednig, Keith R. Bartlett, Robert F. Jenkins
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: Sep 6, 2001
Inventors
Donald A. Starke
John A. Striednig
Keith R. Bartlett
Robert F. Jenkins
Assignee (at issue)
W.R. Grace & Co. Conn.
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.