US4448702A
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Freezing-point-lowering composition and method
Assignee: Lang & Co Chemisch-Technische Produkte KG
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Filing: 1982-09-30
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Granted: 1984-05-15
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Expires: 2002-09-30
Abstract
Abstract The freezing point of an aqueous system is lowered by adding to the system a freezing point lowering quantity of at least one and preferably two or more water soluble salts of dicarboxylic acids having at least three carbon atoms, specifically a dicarboxylic acid selected from the group which consists of adipic, glutaric, succinic and malonic acids, the salt being a sodium, potassium, ammonium or organoamine salt.
Inventors
- 👤 Gertrude Kaes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:39
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20; C09K3/00; C09K3/18; C09K3/185
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
44 words
A method of lowering the freezing point of an aqueous system which comprises the step of adding to said system a freezing point lowering quantity of at least one water soluble salt of at least one dicarboxylic acid having at least three carbon atoms.
Claim 2
Independent Claim
44 words
A method of lowering the freezing point of an aqueous system which comprises the step of adding to said system a freezing point lowering quantity of at least one water soluble salt of at least one dicarboxylic acid having at least three carbon atoms.
Claim 3
Dependent Claim
34 words
The method defined in claim 1 wherein said dicarboxylic acid is selected from the group which consists of adipic, glutaric, succinic and malonic acids, the salt being a sodium, potassium, ammonium or organoamine salt.
Claim 4
Dependent Claim
32 words
The method defined in claim 2 wherein a freezing point lowering composition of a water soluble salt of a blend of at least three of said acids is added to said system.
Claim 5
Dependent Claim
70 words
In an antifreezing and ice melting composition, the improvement wherein an active antifreezing and ice melting component of said composition is at least one water soluble sodium, potassium, ammonium or organoamine salt of at least one dicarboxylic acid having at least three carbon atoms together with at least one further antifreezing and ice dissolving compound selected from the group which consists of urea, inorganic ammonium compounds, and water soluble phosphates.
Claim 6
Dependent Claim
70 words
In an antifreezing and ice melting composition, the improvement wherein an active antifreezing and ice melting component of said composition is at least one water soluble sodium, potassium, ammonium or organoamine salt of at least one dicarboxylic acid having at least three carbon atoms together with at least one further antifreezing and ice dissolving compound selected from the group which consists of urea, inorganic ammonium compounds, and water soluble phosphates.
Claim 7
Dependent Claim
39 words
The improvement defined in claim 4 wherein said active component consists of water soluble salts and a dicarboxylic acid blend of at least two dicarboxylic acids selected from the group which consists of adipic, glutaric, succinic and malonic acids.
Claim 8
Dependent Claim
22 words
The improvement defined in claim 5 wherein said blend is a mix of adipic acid, glutaric acid and succinic acid potassium salts.
Claim 9
Dependent Claim
22 words
The improvement defined in claim 5 wherein said blend is a mix of malonic acid, succinic acid and glutaric acid potassium salts.
References Cited (Backward Citations)
US2233185A
Cited
US2971023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |