Granted Patent
Utility
US 5,286,461 · App. 07/762,755
Method and apparatus for melt level detection in czochralski crystal growth systems
Inventors:
Jurek K. Koziol, Jonathan A. Talbott
Patented Case
View Patent ↗
Granted: Feb 15, 1994
Filed: Sep 20, 1991
Inventors
Jurek K. Koziol
Jonathan A. Talbott
Assignee (at issue)
Ferrofluidics Corporation
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.