Granted Patent
Utility
US 4,846,677 · App. 07/231,072
Castable buttress for rotary kiln heat exchanger and method of fabricating
Inventors:
Raymond J. Crivelli, Roger Snellman
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Aug 11, 1988
Inventors
Raymond J. Crivelli
Roger Snellman
Assignee (at issue)
Dresser Industries, 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.