Granted Patent
Utility
US 4,256,556 · App. 05/963,611
Anodically polarized surface for biofouling and scale control
Inventors:
John E. Bennett, Joseph E. Elliott
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Nov 24, 1978
Inventors
John E. Bennett
Joseph E. Elliott
Assignee (at issue)
Diamond Shamrock 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.