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:
Dec. 19, 2000
Filed:
May. 18, 1998
Applicant:
Inventors:
William H Webster, Portland, ME (US);
Alfred E Fox, Newton, MA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ; G01N / ;
U.S. Cl.
CPC ...
436166 ; 436163 ; 422 56 ;
Abstract
A urine pH indicator has a plurality of hydrophilic, non-ionic, polymer foam carrier particles. The carrier particles are impregnated with an indicator complex having more than one chromophore and indicating more than one pH threshold via at least three distinguishable colors. The carrier particles are preferable chopped and soaked in a solution containing the chromophore complex. Upon evaporation of the solvent, the chromophore complex is bound to the carrier particles which can then be spread upon animal litter to receive urine and indicate pH via color display.