Granted Patent
Utility
US 4,990,141 · App. 07/294,786
Single-use syringe
Inventors:
Phillip O. Byrne, Penelope R. Sisson, Harry R. Ingham
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Jan 9, 1989
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.