Granted Patent
Utility
US 5,597,784 · App. 08/465,823
Composite and reinforced coatings on proppants and particles
Inventors:
A. Richard Sinclair, Richard L. Johnson
Patented Case
View Patent ↗
Granted: Jan 28, 1997
Filed: Jun 6, 1995
Inventors
A. Richard Sinclair
Richard L. Johnson
Assignee (at issue)
Santrol, 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.