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:
May. 08, 2012
Filed:
Nov. 20, 2006
James Cedrone, Braintree, MA (US);
George Gonnella, Pepperell, MA (US);
Raymond A. Zagars, Mildford, MA (US);
Robert F. Mcloughlin, Pelham, NH (US);
James Cedrone, Braintree, MA (US);
George Gonnella, Pepperell, MA (US);
Raymond A. Zagars, Mildford, MA (US);
Robert F. McLoughlin, Pelham, NH (US);
Entegris, Inc., Billerica, MA (US);
Abstract
Systems and methods for compensating for pressure increase which may occur in various enclosed spaces of a pumping apparatus are disclosed. Embodiments of the present invention may compensate for pressure increases in chambers of a pumping apparatus by moving a pumping means of the pumping apparatus to adjust the volume of the chamber to compensate for a pressure increase in the chamber. More specifically, in one embodiment, to account for unwanted pressure increases to the fluid in a dispense chamber the dispense motor may be reversed to back out piston to compensate for any pressure increase in the dispense chamber.