Granted Patent
Utility
US 4,957,490 · App. 07/131,228
Injection device
Inventors:
Phillip O. Byrne, Penelope R. Sisson, Harry R. Ingham
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Dec 10, 1987
Inventors
Phillip O. Byrne
Penelope R. Sisson
Harry R. Ingham
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.