Granted Patent
Utility
US 4,484,908 · App. 06/466,979
Method for relieving excess negativity in a drainage device
Inventors:
Leonard D. Kurtz, Joseph LiCausi
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Feb 16, 1983
Inventors
Leonard D. Kurtz
Joseph LiCausi
Assignee (at issue)
Bioresearch, Inc.
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.