US3624243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibition of corrosive action of fluid deicer composition
Assignee: Honeywell International Inc
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Filing: 1970-02-27
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Granted: 1971-11-30
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Expires: 1990-02-27
Abstract
Abstract Cadmium, aluminum and magnesium metal corrosion by an aqueous deicer solution containing urea, ammonium nitrate and ethylene glycol is inhibited by incorporating therein about 0.05 percent to 0.40 percent by weight of a water-soluble mercaptobenzothiazole salt and about 0.05 percent to 0.40 percent by weight of a water-soluble chromate salt. The deicer solution is preferably for use to deice aircraft runways.
Inventors
- 👤 Herbert F Scott Jr
- 👤 William P Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:23
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C09; C09K; C09K3/00; C09K3/18; C09K3/185
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
26 words
A process as claimed in claim 1, further comprising incorporating in the deicer solution about 0.05 percent to 0.50 percent by weight of ammoniated superphosphoric acid.
Claim 2
Dependent Claim
48 words
A process as claimed in claim 1, wherein the mercaptobenzothiazole salt is selected from the group consisting of sodium mercaptobenzothiazole, potassium mercaptobenzothiazole and ammonium mercaptobenzothiazole, and about 0.05 percent to 0.20 percent by weight of the mercaptobenzothiazole salt is incorporated based on the total weight of the solution.
Claim 3
Dependent Claim
48 words
A process as claimed in claim 1, wherein the chromate salt is selected from the group consisting of sodium chromate, potassium chromate and ammonium chromate and about 0.05 percent to 0.20 percent by weight of the chromate salt is incorporated based on the total weight of the solution.
Claim 4
Dependent Claim
98 words
A process for controlling corrosiveness to cadmium, aluminum, and magnesium metals of an aqueous deicer solution, said solution having a urea content of from about 22 percent to 23 percent by weight, an ammonium nitrate content of from about 29 percent to 30 percent by weight, and an ethylene glycol content of from about 24 to 25 percent by weight, which process comprises incorporating in said solution about 0.05 percent to 0.20 percent by weight of sodium mercaptobenzothiazole and about 0.05 percent to 0.20 percent by weight of sodium chromate, based on the total weight of the solution.
Claim 5
Dependent Claim
87 words
As a new composition of matter of low corrosiveness toward cadmium, aluminum, and magnesium metals, an aqueous deicer solution containing from about 22 percent to 26 percent by weight urea, from about 28 percent to 34 percent by weight ammonium nitrate, from about 25 percent to 30 percent by weight ethylene glycol, from about 0.05 percent to 0.40 percent by weight of a water-soluble mercaptobenzothiazole salt, from about 0.05 percent to 0.40 percent by weight of a water-soluble chromate salt, and the balance substantially consisting of water.
Claim 6
Dependent Claim
24 words
A composition as claimed in claim 6, wherein the composition further contains about 0.05 percent to 0.50 percent by weight of ammoniated superphosphoric acid.
Claim 7
Dependent Claim
48 words
A composition as claimed in claim 6, wherein the mercaptobenzothiazole salt is selected from the group consisting of sodium mercaptobenzothiazole, potassium mercaptobenzothiazole and ammonium mercaptobenzothiazole, and about 0.05 percent to 0.20 percent by weight of the mercaptobenzothiazole salt is present based on the total weight of the composition.
Claim 8
Dependent Claim
48 words
A composition as claimed in claim 6, wherein the chromate salt is selected from the group consisting of sodium chromate, potassium chromate and ammonium chromate, and about 0.05 percent to 0.20 percent by weight of the chromate salt is present based on the total weight of the composition.
Claim 9
Dependent Claim
83 words
As a new composition of matter of low corrosiveness toward cadmium, aluminum, and magnesium metals, an aqueous deicer solution containing from about 22 percent to 23 percent by weight urea, from about 29 percent to 30 percent by weight ammonium nitrate, from about 24 percent to 25 percent by weight ethylene glycol, from about 0.05 percent to 0.20 percent by weight of sodium mercaptobenzothiazole, from about 0.05 percent to 0.20 percent by weight of sodium chromate, and the balance substantially consisting of water.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |