Granted Patent
Utility
US 5,649,987 · App. 08/433,930
Process for producing tabular building and decorative materials similar to natural stone
Inventor:
Norbert Greulich
Patented Case
View Patent ↗
Granted: Jul 22, 1997
Filed: May 2, 1995
Inventor
Norbert Greulich
Assignee (at issue)
Schott Glaswerke
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.