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US3607782A Expired / Lapsed US ⏱️ 0.0 years remaining

Moisture content indicator for refrigeration systems containing cobalt-substituted sulfonic acid cation exchanger

Assignee: Emerson Electric Co
•
Filing: 1968-07-30
•
Granted: 1971-09-21
•
Expires: 1988-07-30
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Abstract

Abstract Cobalt-substituted sulfonic acid cation exchangers, the functional part of which is the sulfonic acid moiety which is uniformly distributed and supported on an organic base or matrix. The sulfonic acid cation exchangers may be polymers of the polyvinyl aryl type and particularly cobalt-substituted sulfonated polystyrene divinylbenzene copolymer type ion exchange resins which are used as moisture indicators by providing readily detectable color changes with increase and decrease of ambient moisture content. In particular, they can give readily detectable color changes in ambients with as low as a few parts per million of moisture. Different percentages of cobalt substitution may be used, the lower proportions of cobalt being more sensitive in the minimal moisture ranges. The material may be used loose or may be bonded into a separate matrix with some inert material by use of an appropriate binder such as an epoxy resin. The invention is especially applicable to detecting moisture in halogenated refrigerants in closed refrigeration systems in either liquid or vapor phases. It may also be used in other ambients having limited water solubility.

Inventors

  • 👤 Shelvin Rosen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 13:14
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/222; B; B01; B01J; B01J39/00; B01J39/04; B01J39/05; C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 35 words
In the method of claim 1: the material consisting essentially of a solid inert organic matrix, said matrix having uniformly distributed sulfonic acid groups at least part of the groups having cobalt as the cation.
Claim 2
Dependent Claim 22 words
In the method of claim 1: the material consisting essentially of a cobalt-substituted ion exchange resin of the sulfonated polyvinyl aryl type.
Claim 3
Dependent Claim 21 words
In the method of claim 1: the material consisting essentially of a cobalt-substituted ion exchange resin of the sulfonated polystyrene type.
Claim 4
Dependent Claim 23 words
In the method of claim 1: the material consisting essentially of a cobalt-substituted ion exchange resin of the sulfonated polystyrene divinylbenzene copolymer cobalt-substituted
Claim 5
Dependent Claim 23 words
In the method of claim 1, the steps including interposing a mass of the material in beadlike form down to about 400 mesh.
Claim 6
Dependent Claim 43 words
In the method of claim 1: including interposing the material in the form of a self-supporting blocklike mass, consisting essentially of beads of the recited material bonded together by a binder that does not destroy the ability of the material to adsorb moisture.
Claim 7
Dependent Claim 60 words
A water sensing material consisting essentially of a cobalt substituted ion-exchange resin of the sulfonated type, said sulfonated groups being permanently bound to a solid inert organic matrix, said matrix having uniformly distributed sulfonic acid groups at least part of the groups having cobalt as the cation, the cobalt substitution being at least about 15 percent complete and evenly distributed.
Claim 8
Dependent Claim 20 words
A water-sensing material of claim 8 consisting essentially of a cobalt-substituted ion exchange resin of the sulfonated polyvinyl aryl type.
Claim 9
Dependent Claim 20 words
The water-sensing material of claim 8 consisting essentially of a cobalt-substituted ion exchange resin of the sulfonated polystyrene divinylbenzene type.
Claim 10
Dependent Claim 18 words
The material of any one of claims 8, 9 and 10 wherein the cobalt substitution is substantially complete.
Claim 11
Dependent Claim 43 words
The material of any one of claims 8, 9 and 10, wherein the material incorporates a binder in the amount of up to about 50 percent of the weight of the material, and the material is bonded together into a unitary self-supporting mass.
Claim 12
Dependent Claim 50 words
The material of any one of claims 8, 9 and 10, wherein the material incorporates a binder in the amount of up to about 50 percent of the weight of the material, and the material is bonded together into a unitary self-supporting mass and the material includes an inert filler.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-09-20 1975-03-22 1975-09-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-09-20 1979-03-22 1979-09-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-09-20 1983-03-22 1983-09-21 $7700.00 Window Closed / Lapsed

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