Granted Patent
Utility
US 6,640,531 · App. 10/241,878
Rake
Inventors:
Richard Riley, Daryl A. Michael
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Sep 12, 2002
Inventors
Richard Riley
Daryl A. Michael
Assignee (at issue)
Richard A. Riley
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.