Granted Patent
Utility
US 4,977,282 · App. 07/337,599
Production of d-alpha-tocopherol from natural plant sources
Inventors:
William S. Baldwin, Stephen M. Willging, Brock M. Siegel
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Apr 13, 1989
Inventors
William S. Baldwin
Stephen M. Willging
Brock M. Siegel
Assignee (at issue)
Henkel Limited
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.