Granted Patent
Utility
US 4,020,145 · App. 05/557,519
Carbon fiber production
Inventors:
John W. Soehngen, Albert G. Williams
Patented Case
View Patent ↗
Granted: Apr 26, 1977
Filed: Mar 12, 1975
Inventors
John W. Soehngen
Albert G. Williams
Assignee (at issue)
Celanese GmbH
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.