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. 26, 2001
Filed:
Jul. 06, 1999
Timothy A. Good, Royersford, PA (US);
Illinois Tool Works Inc., Glenview, IL (US);
Abstract
Positive and negative ion output are balanced in an electrical ionizer having positive and negative ion emitters, and positive and negative high voltage power supplies associated with the respective positive and negative ion emitters. At least one of the positive and negative high voltage power supplies switches between a high state and a low state. An ion balance sensor is located close to the ion emitters and outputs a voltage value. An ion balance sensor set point voltage value is stored. The voltage value is set to provide a balanced ion condition in the work space near the electrical ionizer. During operation of the electrical ionizer, the output voltage value of the ion balance sensor is compared with the set point voltage value. One of the switchable high voltage power supplies is switched to a high state when it is detected as a result of the comparison that the output voltage value of the ion balance sensor exceeds the set point voltage value in a first direction by a first predetermined amount, and the one of the switchable high voltage power supplies is switched to a low state when it is detected as a result of the comparison that the output voltage value of the ion balance sensor exceeds the set point voltage value in a second direction by a second predetermined amount, the second direction being opposite of the first direction.