Granted Patent
Utility
US 5,217,556 · App. 07/620,958
Continuous process for the preparation of unitary thermoplastic honeycomb containing areas with different physical properties
Inventor:
Barry M. Fell
Patented Case
View Patent ↗
Granted: Jun 8, 1993
Filed: Dec 3, 1990
Inventor
Barry M. Fell
Assignee (at issue)
Hexcel Corporation
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.