Granted Patent
Utility
US 4,006,209 · App. 05/548,283
Method for additive feeding
Inventors:
John J. Chiselko, William Hulbert
Patented Case
View Patent ↗
Granted: Feb 1, 1977
Filed: Feb 10, 1975
Inventors
John J. Chiselko
William Hulbert
Assignee (at issue)
Egan Machinery 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.