Granted Patent
Utility
US 4,524,628 · App. 06/665,814
In line dry material sampler
Inventors:
Lynn A. Knudtson, Glenn R. Sprenger
Patented Case
View Patent ↗
Granted: Jun 25, 1985
Filed: Oct 29, 1984
Inventors
Lynn A. Knudtson
Glenn R. Sprenger
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.