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:
Sep. 02, 2003
Filed:
Oct. 24, 2002
Applicant:
Inventors:
Rebecca A. Lawson, Florence, SC (US);
James W. Lowry, Florence, SC (US);
Assignee:
Sonoco Development, Inc., Hartsville, SC (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N 2/904 ;
U.S. Cl.
CPC ...
G01N 2/904 ;
Abstract
An improved plunger for fluid dispensing cartridges used in automated dispensing systems. The plunger helps control the reflection of ultrasonic signals used to sense the position of the plunger as it moves within the cartridge tube. The plunger has a convex bottom, ink-facing surface and a top surface comprising one or more flat, horizontal surfaces. In the preferred embodiment, the horizontal surfaces are concentric steps.