Granted Patent
Utility
US 4,595,492 · App. 06/672,524
Recovery of phosphorus from dilute waste streams
Inventors:
David A. Crea, James A. Robertson, Jerry A. Keely
Patented Case
View Patent ↗
Granted: Jun 17, 1986
Filed: Nov 19, 1984
Inventors
David A. Crea
James A. Robertson
Jerry A. Keely
Assignee (at issue)
FMC 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.