Granted Patent
Utility
US 6,083,465 · App. 09/266,560
Method and apparatus for continuously calcining gypsum
Inventors:
Robert Piasecki, Larry W. Kingston
Patented Case
View Patent ↗
Granted: Jul 4, 2000
Filed: Mar 11, 1999
Inventors
Robert Piasecki
Larry W. Kingston
Assignee (at issue)
National Gypsum Properties, LLC
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.