Granted Patent
Utility
US 4,252,969 · App. 06/079,411
Process for regulating particle size of finely divided thermoplastic resins
Inventors:
Leo H. Broering, Gary W. Duncan
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Sep 27, 1979
Inventors
Leo H. Broering
Gary W. Duncan
Assignee (at issue)
National Distillers and Chemical 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.