Granted Patent
Utility
US 5,542,255 · App. 08/238,238
High temperature resistant thermal insulation for cryogenic tanks
Inventors:
Duane Preston, Thomas K. Drube
Patented Case
View Patent ↗
Granted: Aug 6, 1996
Filed: May 4, 1994
Inventors
Duane Preston
Thomas K. Drube
Assignee (at issue)
Minnesota Valley Engineering, 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.