Granted Patent
Utility
US 4,955,874 · App. 07/249,808
Drainage device
Inventors:
Quinton Farrar, Frederick A. Everett, Jr., Richard H. Heimann
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: Sep 27, 1988
Inventors
Quinton Farrar
Frederick A. Everett, Jr.
Richard H. Heimann
Assignee (at issue)
Pfizer Hospital Products Group, 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.