Granted Patent
Utility
US 5,029,621 · App. 07/507,757
Push back procedure for preventing drop-former droplet formation in a vacuum assisted solution transfer system with upstream occulusion
Inventor:
Robert Lewis
Patented Case
View Patent ↗
Granted: Jul 9, 1991
Filed: Apr 12, 1990
Inventor
Robert Lewis
Assignee (at issue)
Clintec Nutrition Company
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.