Granted Patent
Utility
US 4,309,245 · App. 06/134,903
Process for manufacturing boron nitride fiber felt using a Fourdrinier machine
Inventors:
John L. Tworek, Gordon R. Rignel
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Mar 28, 1980
Inventors
John L. Tworek
Gordon R. Rignel
Assignee (at issue)
Kennecott Holdings Company
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.