Granted Patent
Utility
US 4,820,545 · App. 06/912,286
Method of bonding ceramic orthodontic appliances
Inventor:
John A. Negrych
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Sep 29, 1986
Inventor
John A. Negrych
Assignee (at issue)
Ceradyne, 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.