Granted Patent
Utility
US 4,917,045 · App. 07/223,020
Silicon compounds in poultry hatching
Inventors:
Karl E. Wiegand, Patrick C. Hu
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Jul 22, 1988
Inventors
Karl E. Wiegand
Patrick C. Hu
Assignee (at issue)
Ethyl 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.