Granted Patent
Utility
US 4,337,103 · App. 04/781,282
Composite propellant with differentially cured area at initial burn surface
Inventors:
Donald E. Elrick, Harry M. Gilbert
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Dec 4, 1968
Inventors
Donald E. Elrick
Harry M. Gilbert
Assignee (at issue)
HERCULES 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.