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:
Nov. 21, 1989
Filed:
Feb. 22, 1989
Applicant:
Inventors:
John W Ogleby, Warrington, GB;
Neville J Charkley, Warrington, GB;
Assignee:
Laporte Industries Limited, London, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
436 98 ; 422 61 ; 422 55 ; 436 89 ; 436163 ;
Abstract
Pool or spa water can be monitored for dimethyl hydantoin content, as a residue of disinfection with halogenated hydantoin, by determining the quantity of base required to adjust the pH to 9.3. The pH may be judged by a suitable indicator for example thymol phthalein or thymol blue. The method can be applied either titrimetrically, or by comparison colorimetrically with standard solutions and may be modified for use in relation to other halogenated hydantoins. The method may be applied to the testing of pools for compliance with an advisory dimethyl hydantoin content limit and may be embodied in a kit for easy poolside use.