Granted Patent
Utility
US 6,054,530 · App. 09/038,544
Continuous process for the preparation of poly(vinyl acetate) for poly(vinyl alcohol) production
Inventors:
Stephen Charles Webb, James F. Nangeroni, Brian Carvill, Beth Ann Frey
Patented Case
View Patent ↗
Granted: Apr 25, 2000
Filed: Mar 11, 1998
Inventors
Stephen Charles Webb
James F. Nangeroni
Brian Carvill
Beth Ann Frey
Assignee (at issue)
Air Products and Chemicals, Inc.
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.