US4455248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antifreeze compositions
Assignee: Shell USA Inc
•
Filing: 1983-10-31
•
Granted: 1984-06-19
•
Expires: 2003-10-31
Abstract
Abstract A single-phase glycol-based antifreeze composition having superior performance in multi-metal corrosion protection contains certain silicate, phosphate, borate, nitrate, azole, and alkali compounds in specified proportions. Such compositions are of particular advantage in inhibiting the corrosion of aluminum surfaces at elevated antifreeze service temperatures.
Inventors
- 👤 Donald L. Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:30
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
146 words
A single-phase glycol antifreeze composition which comprises one or more glycols selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and glycerol and additionally comprising for every 100 parts by weight of said glycol: (a) between about 0.1 and 500 parts by weight water, about 0.10 parts by weight of sodium metasilicate, (b) between about 1.6 and 2.2 parts by weight of a phosphate of potassium, (c) between about 0.15 and 0.50 parts by weight of a compound selected from the group consisting of sodium metaborate and sodium tetraborate, (d) between about 0.10 and 0.40 parts by weight of sodium nitrate, (e) an effective copper corrosion inhibiting amount of a compound selected from the group consisting of tolyltriazole, benzotriazole, and mercaptobenzothiazole, and (f) a quantity of alkali sufficient to provide a pH for the composition of between about 9 and 11.5.
Claim 2
Dependent Claim
146 words
A single-phase glycol antifreeze composition which comprises one or more glycols selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and glycerol and additionally comprising for every 100 parts by weight of said glycol: (a) between about 0.1 and 500 parts by weight water, about 0.10 parts by weight of sodium metasilicate, (b) between about 1.6 and 2.2 parts by weight of a phosphate of potassium, (c) between about 0.15 and 0.50 parts by weight of a compound selected from the group consisting of sodium metaborate and sodium tetraborate, (d) between about 0.10 and 0.40 parts by weight of sodium nitrate, (e) an effective copper corrosion inhibiting amount of a compound selected from the group consisting of tolyltriazole, benzotriazole, and mercaptobenzothiazole, and (f) a quantity of alkali sufficient to provide a pH for the composition of between about 9 and 11.5.
Claim 3
Dependent Claim
90 words
The composition in accordance with claim 1, comprising for every 100 parts by weight of glycol between about 1 and 400 parts by weight of water, about 0.10 parts by weight of sodium metasilicate, between about 1.6 and 2.2 parts by weight of a phosphate of potassium, between about 0.20 and 0.45 parts by weight of sodium metaborate or sodium tetraborate, between about 0.15 and 0.30 parts by weight of sodium nitrate, and a quantity of alkali sufficient to provide pH for the composition of between about 9.5 and 11.
Claim 4
Dependent Claim
73 words
The composition in accordance with claim 2, comprising for every 100 parts by weight of glycol between about 1 and 300 parts by weight of water, about 0.10 parts by weight of sodium metasilicate, between about 1.6 and 2.2 parts by weight of a phosphate of potassium, between about 0.25 and 0.40 parts by weight of sodium metaborate or sodium tetraborate, and between about 0.20 and 0.25 parts by weight of sodium nitrate.
Claim 5
Dependent Claim
28 words
The composition in accordance with claim 3, comprising for every 100 parts by weight of glycol, between about 0.07 and 0.20 parts by weight of tolyltriazole or benzotriazole.
Claim 6
Dependent Claim
26 words
The composition in accordance with claim 3, comprising for every 100 parts by weight of glycol, between about 0.15 and 0.50 parts by weight of mercaptobenzothiazole.
Claim 7
Dependent Claim
109 words
A single-phase glycol-based antifreeze concentrate which comprises for every 100 parts by weight of ethylene glycol, between 1 and 5 parts by weight of water, about 0.10 parts by weight of sodium metasilicate, between about 1.6 and 2.2 parts by weight of a phosphate of potassium, between about 0.30 and 0.35 parts by weight of sodium metaborate or sodium tetraborate, between about 0.20 and 0.25 parts by weight of sodium nitrate, and effective copper corrosion inhibiting amount of a compound selected from the group consisting of tolyltriazole, benzotriazole, and mercaptobenzothiazole, and a quantity of alkali sufficient to provide a pH for the composition of between about 10 and 10.8.
Claim 8
Dependent Claim
109 words
A single-phase glycol-based antifreeze concentrate which comprises for every 100 parts by weight of ethylene glycol, between 1 and 5 parts by weight of water, about 0.10 parts by weight of sodium metasilicate, between about 1.6 and 2.2 parts by weight of a phosphate of potassium, between about 0.30 and 0.35 parts by weight of sodium metaborate or sodium tetraborate, between about 0.20 and 0.25 parts by weight of sodium nitrate, and effective copper corrosion inhibiting amount of a compound selected from the group consisting of tolyltriazole, benzotriazole, and mercaptobenzothiazole, and a quantity of alkali sufficient to provide a pH for the composition of between about 10 and 10.8.
Claim 9
Dependent Claim
28 words
The composition in accordance with claim 6, comprising for every 100 parts by weight of glycol between about 0.07 and 0.20 parts by weight of tolyltriazole or benzotriazole.
Claim 10
Dependent Claim
26 words
The composition in accordance with claim 6, comprising for every 100 parts by weight of glycol, between about 0.15 and 0.50 parts by weight of mercaptobenzothiazole.
Claim 11
Dependent Claim
15 words
The composition in accordance with claim 1, wherein the phosphate of potassium is dipotassium phosphate.
Claim 12
Dependent Claim
15 words
The composition in accordance with claim 2, wherein the phosphate of potassium is dipotassium phosphate.
Claim 13
Dependent Claim
15 words
The composition in accordance with claim 3, wherein the phosphate of potassium is dipotassium phosphate.
Claim 14
Dependent Claim
15 words
The composition in accordance with claim 4, wherein the phosphate of potassium is dipotassium phosphate.
Claim 15
Dependent Claim
15 words
The composition in accordance with claim 5, wherein the phosphate of potassium is dipotassium phosphate.
Claim 16
Dependent Claim
15 words
The composition in accordance with claim 6, wherein the phosphate of potassium is dipotassium phosphate.
Claim 17
Dependent Claim
15 words
The composition in accordance with claim 7, wherein the phosphate of potassium is dipotassium phosphate.
Claim 18
Dependent Claim
15 words
The composition in accordance with claim 8, wherein the phosphate of potassium is dipotassium phosphate.
References Cited (Backward Citations)
US2524484A
Cited
US2693451A
Cited
US3445395A
Cited
US4149985A
Cited
US4242214A
Cited
US4382870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |