Granted Patent
Utility
US 4,687,962 · App. 06/941,977
Ultrasonic horn driving apparatus and method with active frequency tracking
Inventor:
Lawrence E. Elbert
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Dec 15, 1986
Inventor
Lawrence E. Elbert
Assignee (at issue)
Baxter Travenol Laboratories, 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.