US4477572A
Expired / Lapsed
US
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Remote monitoring of ester functional fluids
Assignee: Akzo America Inc
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Filing: 1982-05-28
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Granted: 1984-10-16
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Expires: 2002-05-28
Abstract
Abstract The degradation of a hydrolyzable ester containing functional fluid is monitored by placing in the fluid a probe-containing a corrodible metal sensor and measuring by electrical means the corrosion of the sensor.
Inventors
- 👤 Joseph F. Anzenberger, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:15
CPC Classifications
G; G01; G01N; G01N33/00; G01N17/00; F; F16; F16N; F16N29/00; G01N33/26; G01N33/28; G01N33/2888
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
A method of remotely monitoring the degradation of hydrolyzable ester containing functional fluid which comprises placing in said fluid at least one probe containing at least one corrodible metal sensor, said metal sensor having a standard electrode potential of less than -0.13 volts, and measuring by electrical means the corrosion of said metal sensor in said fluid.
Claim 2
Independent Claim
57 words
A method of remotely monitoring the degradation of hydrolyzable ester containing functional fluid which comprises placing in said fluid at least one probe containing at least one corrodible metal sensor, said metal sensor having a standard electrode potential of less than -0.13 volts, and measuring by electrical means the corrosion of said metal sensor in said fluid.
Claim 3
Dependent Claim
50 words
The method of claim 1 wherein the fluid contains at least one-third of a hydrolyzable ester selected from the group consisting of organic ester derived from the reaction of polycarboxylic acid with an alcohol, organic ester derived from the reaction of monocarboxylic acid with polyhyric alcohol, triorganophosphate, and mixtures thereof.
Claim 4
Dependent Claim
40 words
The method of claim 2 wherein said triorganophosphate is represented by the formula; ##STR2## wherein the R groups are the same or different and are selected from alkyl, aryl, alkaryl, and aralkyl groups having from one to twenty carbon atoms.
Claim 5
Dependent Claim
18 words
The method of claim 3 wherein said triorganophosphate contains R groups comprising aryl or alkaryl or mixtures thereof:
Claim 6
Dependent Claim
13 words
The method of claim 3 wherein the triaryl phosphate is a tertiarybutylphenyl/phenyl phosphate.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the metal sensor comprises iron, magnesium, zinc, calcium, sodium, potassium or alloys thereof.
Claim 8
Dependent Claim
11 words
The method of claim 1 wherein the metal sensor comprises zinc.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein said functional fluid is monitored with a plurality of probes.
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein said functional fluid is monitored with a plurality of metal sensors.
Claim 11
Dependent Claim
18 words
The method of claim 1 wherein said electrical means monitors oxidation of the sensor by measuring electrical resistance.
Claim 12
Dependent Claim
18 words
The method of claim 1 wherein the electrical means monitors oxidation of the sensor by measuring electrical impedance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |