US4164434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum alloy capacitor foil and method of making
Assignee: Rio Tinto Switzerland AG
•
Filing: 1977-11-02
•
Granted: 1979-08-14
•
Expires: 1997-11-02
Abstract
Abstract Improved aluminum alloys are disclosed which are particularly useful as foil material in electrical capacitors. These alloys may contain either titanium in an aluminum base or a titanium and boron mixture in an aluminum base. The particular combination of titanium and boron presents a greater increase in capacitance in foil formed from this alloy than the increase in capacitance due to titanium or boron alone. Particular processing of such alloys is also disclosed.
Inventors
- 👤 Julius C. Fister, Jr.
- 👤 John F. Breedis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:33
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H01G9/045; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12993
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
35 words
An aluminum alloy foil having a significant increase in capacitance properties which is particularly useful as foil material in electrical capacitors, said alloy consisting essentially of from 0.005 to 0.03% by weight titanium, balance aluminum.
Claim 2
Dependent Claim
35 words
An aluminum alloy foil having a significant increase in capacitance properties which is particularly useful as foil material in electrical capacitors, said alloy consisting essentially of from 0.005 to 0.03% by weight titanium, balance aluminum.
Claim 3
Dependent Claim
65 words
An alloy foil according to claim 1 wherein an element selected from the group consisting of up to 0.5% by weight for each of silicon and iron, up to 0.1% by weight copper, up to 0.05% by weight for each of manganese and magnesium, up to 0.01% by weight for each of chromium, nickel and zinc, and mixtures thereof, is additionally present in said alloy.
Claim 4
Dependent Claim
22 words
An alloy foil according to claim 1 wherein said alloy consists essentially of from 0.01 to 0.017% by weight titanium, balance aluminum.
Claim 5
Dependent Claim
45 words
An alloy foil according to claim 2 wherein said element is selected from the group consisting of from 0.002 to 0.04% by weight for each of silicon and iron, 0.005% by weight for each of copper, manganese, magnesium, chromium, nickel and zinc, and mixtures thereof.
Claim 6
Dependent Claim
42 words
An aluminum alloy foil having a significant increase in capacitance properties which is particularly useful as foil material in electrical capacitors, said alloy consisting essentially of from 0.005 to 0.03% by weight titanium, from 0.001 to 0.006% by weight boron, balance aluminum.
Claim 7
Dependent Claim
42 words
An aluminum alloy foil having a significant increase in capacitance properties which is particularly useful as foil material in electrical capacitors, said alloy consisting essentially of from 0.005 to 0.03% by weight titanium, from 0.001 to 0.006% by weight boron, balance aluminum.
Claim 8
Dependent Claim
65 words
An alloy foil according to claim 5 wherein an element selected from the group consisting of up to 0.5% by weight for each of silicon and iron, up to 0.1% by weight copper, up to 0.05% by weight for each of manganese and magnesium, up to 0.01% by weight for each of chromium, nickel and zinc, and mixtures thereof, is additionally present in said alloy.
Claim 9
Dependent Claim
29 words
An alloy foil according to claim 5 wherein said alloy consists essentially of from 0.01 to 0.017% by weight titanium, from 0.003 to 0.005% by weight boron, balance aluminum.
Claim 10
Dependent Claim
45 words
An alloy foil according to claim 6 wherein said element is selected from the group consisting of from 0.002 to 0.04% by weight for each of silicon and iron, 0.005% by weight for each of copper, manganese, magnesium, chromium, nickel and zinc, and mixtures thereof.
Claim 11
Dependent Claim
113 words
A process for producing aluminum alloy foil which exhibits high capacitance levels in cold worked tempers, said process comprising the steps of: (a) casting an ingot of an aluminum alloy consisting essentially of from 0.005 to 0.03% by weight titanium, balance aluminum; (b) cleaning and scalping said ingot to remove any visible impurities; (c) homogenizing said ingot at a temperature ranging from 850° to 1175° F. for at least 1/2 hour; (d) hot working said ingot at 450° to 1100° F.; (e) cooling said ingot at a minimum cooling rate of 50° F. per hour; and (f) cold working said ingot to foil with a minimum reduction of 80% to a final gage.
Claim 12
Dependent Claim
113 words
A process for producing aluminum alloy foil which exhibits high capacitance levels in cold worked tempers, said process comprising the steps of: (a) casting an ingot of an aluminum alloy consisting essentially of from 0.005 to 0.03% by weight titanium, balance aluminum; (b) cleaning and scalping said ingot to remove any visible impurities; (c) homogenizing said ingot at a temperature ranging from 850° to 1175° F. for at least 1/2 hour; (d) hot working said ingot at 450° to 1100° F.; (e) cooling said ingot at a minimum cooling rate of 50° F. per hour; and (f) cold working said ingot to foil with a minimum reduction of 80% to a final gage.
Claim 13
Dependent Claim
64 words
A process according to claim 9 wherein an element selected from the group consisting of up to 0.5% by weight for each of silicon and iron, up to 0.1% by weight copper, up to 0.05% by weight for each of manganese and magnesium, up to 0.01% by weight for each of chromium, nickel and zinc, and mixtures thereof, is additionally present in said alloy.
Claim 14
Dependent Claim
21 words
A process according to claim 9 wherein said alloy consists essentially of from 0.01 to 0.017% by weight titanium, balance aluminum.
Claim 15
Dependent Claim
44 words
A process according to claim 10 wherein said element is selected from the group consisting of from 0.002 to 0.04% by weight for each of silicon and iron, 0.005% by weight for each of copper, manganese, magnesium, chromium, nickel and zinc, and mixtures thereof.
Claim 16
Dependent Claim
20 words
A process according to claim 9 wherein said homogenizing is performed from 1090° to 1110° F. for approximately 10 hours.
Claim 17
Dependent Claim
17 words
A process according to claim 9 wherein said hot working is performed from 950° to 1100° F.
Claim 18
Dependent Claim
17 words
A process according to claim 9 wherein said cooling rate is at least 1000° F. per hour.
Claim 19
Dependent Claim
28 words
A process according to claim 9 wherein said cold working is performed with a minimum reduction of 99% to a final gage of between 0.001 and 0.01 inch.
Claim 20
Dependent Claim
9 words
A product produced by the process of claim 9.
Claim 21
Dependent Claim
9 words
A product produced by the process of claim 12.
Claim 22
Dependent Claim
120 words
A process for producing aluminum alloy foil which exhibits high capacitance levels in cold worked tempers, said process comprising the steps of: (a) casting an ingot of an aluminum alloy consisting essentially of from 0.005 to 0.03% by weight titanium, from 0.001 to 0.006% by weight boron, balance aluminum; (b) cleaning and scalping said ingot to remove any visible impurities; (c) homogenizing said ingot at a temperature ranging from 850° to 1175° F. for at least 1/2 hour; (d) hot working said ingot at 450° to 1100° F.; (e) cooling said ingot at a minimum cooling rate of 50° F. per hour; and (f) cold working said ingot to foil with a minimum reduction of 80% to a final gage.
Claim 23
Dependent Claim
120 words
A process for producing aluminum alloy foil which exhibits high capacitance levels in cold worked tempers, said process comprising the steps of: (a) casting an ingot of an aluminum alloy consisting essentially of from 0.005 to 0.03% by weight titanium, from 0.001 to 0.006% by weight boron, balance aluminum; (b) cleaning and scalping said ingot to remove any visible impurities; (c) homogenizing said ingot at a temperature ranging from 850° to 1175° F. for at least 1/2 hour; (d) hot working said ingot at 450° to 1100° F.; (e) cooling said ingot at a minimum cooling rate of 50° F. per hour; and (f) cold working said ingot to foil with a minimum reduction of 80% to a final gage.
Claim 24
Dependent Claim
64 words
A process according to claim 19 wherein an element selected from the group consisting of up to 0.5% by weight for each of silicon and iron, up to 0.1% by weight copper, up to 0.05% by weight for each of manganese and magnesium, up to 0.01% by weight for each of chromium, nickel and zinc, and mixtures thereof, is additionally present in said alloy.
Claim 25
Dependent Claim
28 words
A process according to claim 19 wherein said alloy consists essentially of from 0.01 to 0.017% by weight titanium, from 0.003 to 0.005% by weight boron, balance aluminum.
Claim 26
Dependent Claim
44 words
A process according to claim 20 wherein said element is selected from the group consisting of from 0.002 to 0.04% by weight for each of silicon and iron, 0.005% by weight for each of copper, manganese, magnesium, chromium, nickel and zinc, and mixtures thereof.
Claim 27
Dependent Claim
20 words
A process according to claim 19 wherein said homogenizing is performed from 1090° to 1110° F. for approximately 10 hours.
Claim 28
Dependent Claim
17 words
A process according to claim 19 wherein said hot working is performed from 950° to 1100° F.
Claim 29
Dependent Claim
17 words
A process according to claim 19 wherein said cooling rate is at least 1000° F. per hour.
Claim 30
Dependent Claim
28 words
A process according to claim 19 wherein said cold working is performed with a minimum reduction of 99% to a final gage of between 0.001 and 0.01 inch.
Claim 31
Dependent Claim
9 words
A product produced by the process of claim 19.
Claim 32
Dependent Claim
9 words
A product produced by the process of claim 22.
Claim 33
Dependent Claim
18 words
An alloy foil according to claim 1 wherein said foil is an etched capacitor foil having improved capacitance.
Claim 34
Dependent Claim
18 words
An alloy foil according to claim 5 wherein said foil is an etched capacitor foil having improved capacitance.
Claim 35
Dependent Claim
22 words
A process according to claim 9 wherein said cold working is performed to a final gage of between 0.0001 and 0.425 inch.
Claim 36
Dependent Claim
22 words
A process according to claim 19 wherein said cold working is performed to a final gage of between 0.0001 and 0.425 inch.
Claim 37
Dependent Claim
35 words
An aluminum alloy foil having a significant increase in capacitance properties which is particularly useful as foil material in electrical capacitors, said alloy consisting essentially of from 0.0015 to 0.03% by weight titanium, balance aluminum.
Claim 38
Dependent Claim
35 words
An aluminum alloy foil having a significant increase in capacitance properties which is particularly useful as foil material in electrical capacitors, said alloy consisting essentially of from 0.0015 to 0.03% by weight titanium, balance aluminum.
References Cited (Backward Citations)
US3676111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |