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:
Jul. 30, 2002
Filed:
Feb. 22, 2000
Robert J. Carrico, Elkhart, IN (US);
Serim Research Corporation, Elkhart, IN (US);
Abstract
A test device, method, and indicators for the colorimetric determination of formaldehyde neutralization in an aqueous solution initially containing formaldehyde are provided. Formaldehyde is neutralized by reaction with sulfite ion, where the sulfite ion is provided by dissolving a sulfite-containing compound or neutralizer, such as sodium sulfite, sodium bisulfite, or a mixture thereof, into the aqueous solution containing formaldehyde. The indicators may include dyes capable of exhibiting a color change in the presence of an excess amount of sulfite ion over the amount of formaldehyde in the aqueous solution. A test medium includes the dye, where the test medium may be a test strip impregnated with one of the indicator dyes and optionally a buffer, or a liquid solution containing the dye. The test medium may be contacted with the formaldehyde-containing solution to indicate the neutralization of formaldehyde by exhibiting the color change in the presence of excess sulfite ion, providing a user with a confirmation that the formaldehyde in the solution has been neutralized.