Granted Patent
Utility
US 4,565,680 · App. 06/691,326
Recovery of phosphorus and aluminum from spent acid from the bright-dip aluminum finishing process
Inventors:
Lanny E. Todd, Philip E. Burke, Danny L. Smith, Carla T. Gleason
Patented Case
View Patent ↗
Granted: Jan 21, 1986
Filed: Jan 14, 1985
Inventors
Lanny E. Todd
Philip E. Burke
Danny L. Smith
Carla T. Gleason
Assignee (at issue)
Stauffer Chemical Company
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.