Granted Patent
Utility
US 5,967,779 · App. 08/951,948
Abrasion hand piece for use with abrasion system
Inventors:
John Brassil, Shu Kun Chang, Roberto G. Fraquelli, Gary Neilsson
Patented Case
View Patent ↗
Granted: Oct 19, 1999
Filed: Oct 17, 1997
Inventors
John Brassil
Shu Kun Chang
Roberto G. Fraquelli
Gary Neilsson
Assignee (at issue)
Dentsply Research and Development Corp.
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.