Granted Patent
Utility
US 4,492,777 · App. 06/444,560
Heat treated barium or strontium glass
Inventors:
Robert K. Denton, Jr., Narayan Kumar
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Nov 26, 1982
Inventors
Robert K. Denton, Jr.
Narayan Kumar
Assignee (at issue)
Johnson & Johnson Dental Products 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.