US5132035A
Expired / Lapsed
US
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Deicing compositions comprising calcium magnesium acetate and chelating agent
Assignee: General Atomics International Services Corp
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Filing: 1991-02-08
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Granted: 1992-07-21
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Expires: 2011-02-08
Abstract
Abstract Compositions which comprises a major amount of an alkaline earth or alkali metal carboxylate, a minor amount of unreacted base and impurities, and an effective anti-staining amount of an organic chelating agent are useful as non-staining deicing compositions for use on airport runways and taxiways. The preferred alkaline earth carboxylate is calcium magnesium acetate and the preferred chelating agent is EDTA. Processes for preparation of such compositions are described.
Inventors
- 👤 Karl A. Hoenke
- 👤 Jay D. Rynbrandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:14
CPC Classifications
C; C07; C07C; C07C53/00; C07C53/08; C07C53/10; C09; C09K; C09K3/00; C09K3/18; C09K3/185; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
48 words
An anti-staining deicing composition consisting essentially of a major amount of calcium magnesium acetate and a minor amount of alkaline earth and/or alkali metal base, common impurities in said bases, and at least 3% by weight of ethylenediamine tetraacetic acid in any of its acid or neutralized forms.
Claim 2
Dependent Claim
48 words
An anti-staining deicing composition consisting essentially of a major amount of calcium magnesium acetate and a minor amount of alkaline earth and/or alkali metal base, common impurities in said bases, and at least 3% by weight of ethylenediamine tetraacetic acid in any of its acid or neutralized forms.
Claim 3
Dependent Claim
29 words
A composition according to claim 1 wherein said calcium magnesium acetate is of the formula Ca.sub.x Mg.sub.y (CH.sub.3 COO).sub.2(x+y) wherein x is about 2-6 and y is about 8-4.
Claim 4
Dependent Claim
18 words
A composition according to claim 2 wherein x is 3 or 4 and y is 7 or 6.
Claim 5
Dependent Claim
29 words
A composition according to claim 1 wherein said ethylenediamine tetraacetic acid is characterized by a solubility in water in its neutralized form of at least about 0.3% by weight.
Claim 6
Dependent Claim
28 words
A composition according to claim 1 wherein said bases and impurities comprise less than about 3% by weight magnesium base and less than about 5% by weight water.
Claim 7
Dependent Claim
10 words
A composition according to claim 1 which is substantially anhydrous.
Claim 8
Dependent Claim
16 words
A composition according to claim 3 having a calcium:magnesium ratio of about 4:6 to about 3:7.
Claim 9
Dependent Claim
16 words
A composition according to claim 3 having a calcium:magnesium ratio of about 3:6 to about 3:7.
Claim 10
Dependent Claim
21 words
A non-staining deicing composition which comprises a plurality of layers of a composition according to claim 1 on discrete substrate particles.
Claim 11
Independent Claim
45 words
The method of melting snow and/or ice accumulated or formed on a surface for vehicular use comprising the step of contacting said surface with an effective deicing amount of a composition according to any one of claims 1, 2 to 5, and 6 to 7.
Claim 12
Dependent Claim
15 words
A method according to claim 10 wherein said surface comprises an airport runway or taxiway.
Claim 13
Independent Claim
43 words
A method of preventing accumulation of ice on a surface for vehicular use comprising the step of contacting said surface with an effective ice preventing amount of a composition according to any one of claims 1, 2 to 5, and 6 to 9.
Claim 14
Dependent Claim
15 words
A method according to claim 12 wherein said surface comprises an airport runway or taxiway.
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) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |