US3609086A
Expired / Lapsed
US
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Arsenic trioxide corrosion inhibitor for absorption refrigeration system
Assignee: Trane US Inc
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Filing: 1969-09-15
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Granted: 1971-09-28
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Expires: 1989-09-15
Abstract
Abstract Evolution of hydrogen and corrosion of iron and copper construction materials in a closed, substantially anaerobic refrigeration system of an absorption refrigeration machine is successfully controlled by addition of an arsenic trioxide inhibitor to the lithium bromide absorbent solution. The absorbent solution is maintained at a basicity of from 0.1N to 0.5N based on a 60 percent lithium bromide solution.
Inventors
- 👤 Robert J Modahl
- 👤 Paul J Lynch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:57
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/06; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/047; Y; Y10; Y10S; Y10S62/00; Y10S62/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
The absorbent solution of claim 1 wherein hydroxyl ion is provided by lithium hydroxide.
Claim 2
Dependent Claim
25 words
The absorbent solution of claim 2 wherein the As2O3 is present in solution in an amount greater than 200 mg. per liter of absorbent solution.
Claim 3
Dependent Claim
22 words
The absorbent solution of claim 3 wherein the normality of the said lithium bromide solution ranges from about 0.1 to about 0.3.
Claim 4
Dependent Claim
29 words
The absorbent solution of claim 4 wherein the As2O3 is present in an amount from about 200 mg. per liter to about 2,000 mg. per liter of absorbent solution.
Claim 5
Dependent Claim
28 words
The absorbent solution of claim 5 wherein the As2O3 is present in an amount from about 200 mg. per liter to about 700 mg. per liter of solution.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |