Granted Patent
Utility
US 4,977,892 · App. 07/430,903
Wound dressing with hydrophilic absorbent layer
Inventor:
Ralph Ewall
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Oct 3, 1989
Inventor
Ralph Ewall
Assignee (at issue)
B. F. Goodrich Company
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.