Granted Patent
Utility
US 4,856,972 · App. 07/204,382
Dual roller peristaltic pump
Inventors:
Peter J. Van Benschoten, David H. Burkett
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Jun 9, 1988
Inventors
Peter J. Van Benschoten
David H. Burkett
Assignee (at issue)
Fisher Scientific Company, L.L.C.
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.