Granted Patent
Utility
US 4,229,294 · App. 06/042,178
Hydroxypropylene-amino-phosphonic-sulfonic acids for inhibiting scale formation
Inventors:
Derek Redmore, Frederick T. Welge
Patented Case
View Patent ↗
Granted: Oct 21, 1980
Filed: May 24, 1979
Inventors
Derek Redmore
Frederick T. Welge
Assignee (at issue)
Petrolite Corporation
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.