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. 05, 1999
Filed:
Jun. 18, 1997
Richard H Ferguson, New Martinsville, WV (US);
Gerald E Moore, Sistersville, WV (US);
Stanley R Pickens, Monroeville, PA (US);
PPG Industries Ohio, Inc., Cleveland, OH (US);
Abstract
A method of controlling the amount of conductivity increasing substances, e.g., free available halogen, in particular free available chlorine, present in an aqueous medium is described. In accordance with the method of the present invention, an aqueous medium is provided and its conductivity determined. A source of at least one conductivity increasing substance is introduced controllably into the aqueous medium, and a second conductivity measurement is made. The determined conductivities are compared, and in response to this comparison, the amount of conductivity increasing substance added to the aqueous medium is adjusted. In a preferred embodiment of the present invention, the aqueous medium is an aqueous stream, and the source of conductivity increasing substance is calcium hypochlorite, which is introduced into the aqueous stream through the use of a feeder unit, i.e., a chlorination unit.