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, 2004
Filed:
Jul. 30, 2002
Applicant:
Inventors:
Tim Hogan, Rock Island, IL (US);
Thomas J. Amsler, Grayslake, IL (US);
James R. Cleveland, Carpentersville, IL (US);
Assignee:
Fluid Management, Inc., Wheeling, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B 1/26 ; F04B 7/04 ;
U.S. Cl.
CPC ...
F04B 1/26 ; F04B 7/04 ;
Abstract
A fluid dispense system having a computer control system that operatively controls a stepper motor driving a pump. The stepper motor actuates the pump piston through partial revolutions. The computer control system determines the number of stepper motor steps required to pump a desired amount of fluid by the pump by rotating the piston through segments which are less than a full revolution. Further, the controller varies the speed of the stepper motor to avoid splashing of the dispense fluid and motor stalling.