Granted Patent
Utility
US 6,051,431 · App. 08/987,067
Selection marker gene free recombinant strains: a method for obtaining them and the use of these strains
Inventors:
Gerardus Cornelius Maria Selten, Bart Willem Swinkels, Robertus Franciscus Maria Van Gorcom
Patented Case
View Patent ↗
Granted: Apr 18, 2000
Filed: Dec 8, 1997
Inventors
Gerardus Cornelius Maria Selten
Bart Willem Swinkels
Robertus Franciscus Maria Van Gorcom
Assignee (at issue)
DSM N.V.
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.