Granted Patent
Utility
US 4,904,894 · App. 07/302,295
Hail sensor
Inventors:
John C. Henry, Kyung-Tae Park, Edward Tom
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Jan 24, 1989
Inventors
John C. Henry
Kyung-Tae Park
Edward Tom
Assignee (at issue)
Pennwalt 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.