Granted Patent
Utility
US 5,208,021 · App. 07/301,376
Method of preparing diphtheria immunotoxins
Inventors:
Virginia G. Johnson, Larry Greenfield, Richard J. Youle, Walter J. Laird
Patented Case
View Patent ↗
Granted: May 4, 1993
Filed: Jan 25, 1989
Inventors
Virginia G. Johnson
Larry Greenfield
Richard J. Youle
Walter J. Laird
Assignees (at issue)
The United States of America as Represented by the Secretary of the Department of Health and Human Services
Cetus Corporation
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.