Granted Patent
Utility
US 4,767,643 · App. 06/888,292
Method of continuously vacuum impregnating fibrous sheet material
Inventors:
Dean C. Westervelt, Wei-Fang Su
Patented Case
View Patent ↗
Granted: Aug 30, 1988
Filed: Jul 22, 1986
Inventors
Dean C. Westervelt
Wei-Fang Su
Assignee (at issue)
Westinghouse Electric Company 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.