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:
Jun. 15, 1993
Filed:
Sep. 06, 1991
Charles F Spence, Pasadena, CA (US);
Steven M Clark, Pasadena, CA (US);
California Institute of Technology, Pasadena, CA (US);
Abstract
A syringe pump, uses a stepping motor to rotate a lead screw with precision and in turn advance a zero-backlash ball nut or vice-versa to drive the syringe plunger. This invention is designed to eliminate virtually all forces that are not coaxially aligned with the plunger's axis by utilizing a drive shaft kinematically supported on a reference member. The barrel of the syringe is kinematically supported on the reference member with its axis aligned with the axis of the drive shaft. The drive shaft is advanced by the ball nut and drive shaft assembly to drive the plunger which is kinematically supported at one end by the end of the drive shaft and at the other end by the internal wall of the barrel.