Granted Patent
Utility
US 4,899,733 · App. 07/286,561
Device and technique for transurethral ultrasonic lithotripsy using a flexible ureteroscope
Inventors:
Eugene DeCastro, Roger Goodfriend
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Dec 19, 1988
Inventors
Eugene DeCastro
Roger Goodfriend
Assignee (at issue)
Blackstone Ultrasonic, 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.