Granted Patent
Utility
US 6,228,905 · App. 09/298,609
Drop forming method and sulphur polymer concrete process
Inventors:
Allan F. Soderberg, Paul Terness, Derril Locke Thomas
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Apr 26, 1999
Inventors
Allan F. Soderberg
Paul Terness
Derril Locke Thomas
Assignee (at issue)
Cominco, Ltd.
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.