Granted Patent
Utility
US 5,004,491 · App. 07/527,144
Glass sheet forming method and apparatus utilizing lower full surface vacuum mold and upper ring mold
Inventors:
Ronald A. McMaster, Donivan M. Shetterly
Patented Case
View Patent ↗
Granted: Apr 2, 1991
Filed: May 22, 1990
Inventors
Ronald A. McMaster
Donivan M. Shetterly
Assignee (at issue)
Glasstech, 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.