The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 29, 1983
Filed:
Dec. 24, 1981
Applicant:
Inventor:
William R Tolbert, Manchester, MO (US);
Assignee:
Monsanto Company, St. Louis, MO (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417315 ; 417383 ; 417478 ; 1372695 ; 13751627 ; 137534 ;
Abstract
A low trauma, reversible flow pumping system is disclosed which is useful for transfer of biological fluids containing fragile components such as cells. The pumping system comprises a length of collapsible and flexible tubing in fluid communication at each end with a two-way, gravity actuated check valve means having a self-centering, vertically slidable weight member for directional regulation of fluid flow. Said tubing is sealingly enclosed within a hydraulic fluid containing chamber which is in fluid communication with oscillatory pressure providing means to cause alternate expansion and contraction of said tubing.