US3980449A
Expired / Lapsed
US
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Inhibition of lead corrosion
Assignee: Baker Petrolite LLC
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Filing: 1974-07-25
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Granted: 1976-09-14
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Expires: 1994-07-25
Abstract
Abstract This invention relates to the inhibition of lead corrosion in fuel, for example, in residual fuels, such as in those fuels used in steam boilers and gas turbines, by adding certain metals thereto such as magnesium, calcium, aluminum, silicon, and combinations thereof.
Inventors
- 👤 Michael J. Zetlmeisl
- 👤 Walter R. May
- 👤 Robert R. Annand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:43
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/12; C10L1/1208
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
32 words
A composition comprising a hydrocarbon fuel oil containing corrosive amounts of lead, a lead-vanadium mixture or a lead-vanadium-sodium mixture and corrosion inhibiting amounts of metallic magnesium, calcium, aluminum, silicon or combinations thereof.
Claim 2
Dependent Claim
32 words
A composition comprising a hydrocarbon fuel oil containing corrosive amounts of lead, a lead-vanadium mixture or a lead-vanadium-sodium mixture and corrosion inhibiting amounts of metallic magnesium, calcium, aluminum, silicon or combinations thereof.
Claim 3
Dependent Claim
14 words
The hydrocarbon fuel oil composition of claim 1 where the corrosion inhibitor is magnesium.
Claim 4
Dependent Claim
24 words
The hydrocarbon fuel oil composition of claim 2 where the corrosive material is lead and the ratio of magnesium to lead is about 3.
Claim 5
Dependent Claim
19 words
The hydrocarbon fuel oil composition of claim 1 where the corrosion inhibitor is a mixture of magnesium and silicon.
Claim 6
Dependent Claim
37 words
The hydrocarbon fuel oil composition of claim 4 where the corrosive material is lead, the ratio of magnesium to lead being at least about 1.5 and the ratio of silicon to lead being at least about 1.5.
Claim 7
Dependent Claim
62 words
The hydrocarbon fuel oil composition of claim 1 where the corrosive material is a mixture of lead, vanadium and sodium and the corrosion inhibitor is a mixture of magnesium and silicon where the ratio of magnesium plus silicon to lead plus vanadium is at least about 4 and the ratio of sodium to lead plus vanadium is about 0.1 to about 0.125.
Claim 8
Dependent Claim
57 words
The hydrocarbon fuel oil composition of claim 1 where the corrosive material is a mixture of lead, vanadium and sodium and the corrosion inhibitor is calcium and aluminum where the ratio of calcium plus aluminum to lead plus vanadium is at least about 3 and the sodium to lead plus vanadium ratio is less than about 0.1.
Claim 9
Dependent Claim
27 words
The hydrocarbon fuel oil composition of claim 7 where there is also present silicon in a ratio of silicon to lead of about 1 to about 4.
Claim 10
Dependent Claim
57 words
The hydrocarbon fuel oil composition of claim 1 where the corrosive material is a mixture of lead, vanadium and sodium and the corrosion inhibitor is aluminum, the ratio of aluminum to lead plus vanadium ranging from about 2 to about 6 and the ratio of sodium to lead plus vanadium ranging from about 0.01 to about 0.1.
Claim 11
Dependent Claim
42 words
The hydrocarbon fuel oil composition of claim 1 where the corrosive material is lead and the corrosion inhibitor is a mixture of magnesium and aluminum where the ratios of magnesium to lead and aluminum to lead ranges from 1 to about 4.
Claim 12
Dependent Claim
26 words
The hydrocarbon fuel of claim 10 where there may also be present silicon, the ratio of silicon to lead ranging from about 1 to about 4.
Claim 13
Dependent Claim
41 words
A process for inhibiting corrosion in a hydrocarbon fuel oil containing corrosive amounts of lead, a lead-vanadium mixture or a lead-vanadium-sodium mixture which comprises adding to said fuel oil corrosion inhibiting amounts of metallic magnesium, calcium, aluminum, silicon or combinations thereof.
Claim 14
Dependent Claim
41 words
A process for inhibiting corrosion in a hydrocarbon fuel oil containing corrosive amounts of lead, a lead-vanadium mixture or a lead-vanadium-sodium mixture which comprises adding to said fuel oil corrosion inhibiting amounts of metallic magnesium, calcium, aluminum, silicon or combinations thereof.
Claim 15
Dependent Claim
11 words
The process of claim 12 where the corrosion inhibitor is magnesium.
Claim 16
Dependent Claim
30 words
The process of claim 13 where the fuel oil contains lead as the corrosive material and the magnesium is added in a ratio of magnesium to lead of about 3.
Claim 17
Dependent Claim
19 words
The process of claim 12 where the fuel oil corrosion inhibitor added is a mixture of magnesium and silicon.
Claim 18
Dependent Claim
39 words
The process of claim 15 where the fuel oil contains lead as the corrosive material and the magnesium and silicon are each added in a ratio of magnesium to lead and silicon to lead of at least about 1.5.
Claim 19
Dependent Claim
64 words
The process of claim 12 where the fuel oil contains a mixture of lead, vanadium and sodium as the corrosive material and the corrosion inhibitor added is a mixture of magnesium and silicon in a ratio of magnesium plus silicon to lead plus vanadium of at least about 4 and the ratio of sodium to lead plus vanadium is about 0.1 to about 0.125.
Claim 20
Dependent Claim
63 words
The process of claim 12 where the fuel oil contains a mixture of lead, vanadium and sodium as the corrosive material and the corrosion inhibitor added is a mixture of calcium and aluminum in a ratio of calcium plus aluminum to lead plus vanadium of at least about 3 and the ratio of sodium to lead plus vanadium is less than about 0.1.
Claim 21
Dependent Claim
24 words
The process of claim 18 where there is also added silicon in a ratio of silicon to lead of about 1 to about 4.
Claim 22
Dependent Claim
60 words
The process of claim 12 where the fuel oil contains a mixture of lead, vanadium and sodium as the corrosive material and the corrosion inhibitor added is aluminum in a ratio of aluminum to lead plus vanadium ranging from about 2 to about 6 and the ratio of sodium to lead plus vanadium ranges from about 0.01 to about 0.1.
Claim 23
Dependent Claim
44 words
The process of claim 12 where the fuel oil contains lead as the corrosive material and the corrosion inhibitor added is a mixture of magnesium and aluminum in a ratio of magnesium to lead and aluminum to lead of about 1 to about 4.
Claim 24
Dependent Claim
24 words
The process of claim 21 where there is also added silicon in a ratio of silicon to lead of about 1 to about 4.
References Cited (Backward Citations)
GB744141A
Cited
US3817722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |