Granted Patent
Utility
US 5,261,491 · App. 07/770,691
Method for inhibiting scale formation
Inventors:
Nevin John Stewart, Patrica Alexandra Mary Walker
Patented Case
View Patent ↗
Granted: Nov 16, 1993
Filed: Oct 3, 1991
Inventors
Nevin John Stewart
Patrica Alexandra Mary Walker
Assignee (at issue)
Britoil p.l.c.
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.