US4019992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibitors for absorption refrigeration systems
Assignee: York International Corp
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Filing: 1975-11-03
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Granted: 1977-04-26
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Expires: 1995-11-03
Abstract
Abstract Working fluid compositions for absorption refrigeration systems comprising alcohol, lithium bromide, zinc bromide and a synergistic mixture of arsenic trioxide and the sodium salt of ethylenediaminetetraacetic acid which are markedly inhibited in corrosion of ferrous metals, and a method for inhibiting the corrosion of ferrous metals by alcohol-lithium bromide-zinc bromide mixture by adding a synergistic combination of arsenic trioxide and ethylenediaminetetraacetic acid.
Inventors
- 👤 Robert Harold Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:54
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/047; C23; C23F; C23F11/00; C23F11/08; Y; Y10; Y10S; Y10S62/00; Y10S62/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
An anhydrous working fluid composition for use in absorption refrigeration systems comprising from 52 to 25% by weight alcohol, and from 48 to 75% by weight of a 2/1 mole ratio lithium bromide/zinc bromide mixture and from 0.2 to about 1% by weight based on said working fluid of a 1:1 mixture of the sodium salt of ethylenediamine tetraacetic acid and arsenic trioxide.
Claim 2
Dependent Claim
63 words
An anhydrous working fluid composition for use in absorption refrigeration systems comprising from 52 to 25% by weight alcohol, and from 48 to 75% by weight of a 2/1 mole ratio lithium bromide/zinc bromide mixture and from 0.2 to about 1% by weight based on said working fluid of a 1:1 mixture of the sodium salt of ethylenediamine tetraacetic acid and arsenic trioxide.
Claim 3
Independent Claim
53 words
A method for inhibiting the corrosion of ferrous metal surfaces in absorption refrigeration systems using as the working fluid an unhydrous solution of lithium bromide and zinc bromide in alcohol comprising adding to the working fluid an effective amount of a 1:1 mixture of the sodium salt of ethylenediaminetetraacetic acid and arsenic trioxide.
Claim 4
Independent Claim
53 words
A method for inhibiting the corrosion of ferrous metal surfaces in absorption refrigeration systems using as the working fluid an unhydrous solution of lithium bromide and zinc bromide in alcohol comprising adding to the working fluid an effective amount of a 1:1 mixture of the sodium salt of ethylenediaminetetraacetic acid and arsenic trioxide.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |