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:
Oct. 07, 2014
Filed:
Nov. 27, 2002
David M. Pittman, Brooklyn Park, MN (US);
VU K. Nguyen, Brooklyn Park, MN (US);
David M. Pittman, Brooklyn Park, MN (US);
Vu K. Nguyen, Brooklyn Park, MN (US);
Graco Inc., Minneapolis, MN (US);
Abstract
The controller of the plural component proportioner () dispenses both components (or all three if a three component material) simultaneously (at least initially) and maintains ratio at the end of each predetermined volume of material by determining which component pump () has reached the desired amount of travel (given the resolution available) and using a valve () to shut off output of that pump until the other side has caught up. At pump changeover, the output valve for that pump () is shut off and the air motor () allowed to run until travel stops to account for cavitation, air entrainment, compressibility, or poor inlet check performance.