Granted Patent
Utility
US 5,069,740 · App. 07/185,334
Production of semiconductor grade silicon spheres from metallurgical grade silicon particles
Inventors:
Jules D. Levine, Millard J. Jensen
Patented Case
View Patent ↗
Granted: Dec 3, 1991
Filed: Apr 21, 1988
Inventors
Jules D. Levine
Millard J. Jensen
Assignee (at issue)
Texas Instruments Incorporated
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.