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. 05, 1989
Filed:
May. 13, 1988
Applicant:
Inventors:
Alan Gray, Amersham, GB;
Alfred J Arch, Ongar, GB;
Assignee:
Alcan International Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
422263 ; 137268 ; 1651341 ; 2101981 ; 222 54 ; 422266 ;
Abstract
A capsule 1 (FIG. 1) for the treatment of water in an aqueous heat transfer apparatus comprises open top compartments 2, 3 and luges 6 to bear against and grip the inside of a passage in which the capsule is located. The open tops of the compartments are closed by means of covers of controlled release glass which dissolve in water at different rates. The capsule can be arranged to release a first dose of corrosion inhibitor on exposure to water under relatively milder conditions and a second dose of corrosion inhibitor on exposure to water under relatively severer conditions.