Granted Patent
Utility
US 5,723,454 · App. 08/753,508
Method for obtaining estrogens from pregnant mare urine by solid phase extraction on a semi-polar adsorber resin
Inventors:
Ivan Ban, Henning Heinemann, Gerhard Mechtold, Heinz-Helmer Rasche
Patented Case
View Patent ↗
Granted: Mar 3, 1998
Filed: Nov 26, 1996
Inventors
Ivan Ban
Henning Heinemann
Gerhard Mechtold
Heinz-Helmer Rasche
Assignee (at issue)
Sovlay Deutschland GmbH
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.