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Patent US3668449A successfully refreshed from Google Patents.
US3668449A
Expired / Lapsed
US
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Aluminum clad copper commutator for use with aluminum armature wire
Assignee: Olin Corp
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Filing: 1970-10-13
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Granted: 1972-06-06
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Expires: 1990-10-13
Abstract
Abstract A new and improved electrical commutator comprising a plurality of spaced apart plates wherein said plates have at least one outwardly projecting finger for holding an armature wire and wherein the plates are copper and the finger is copper integrally bonded to a side of aluminum.
Inventors
- 👤 John B King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:22
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/32; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
34 words
An electrical commutator in accordance with claim 1 wherein said copper is selected from the group consisting of L Oxygen Electrolytic Tough Pitch Copper, Electrolytic Tough Pitch Copper, and Oxygen Free High Conductivity Copper.
Claim 2
Dependent Claim
23 words
An electrical commutator in accordance with claim 2 wherein said aluminum is selected from the group consisting of A.A. 1100 E.C. grade aluminum.
Claim 3
Dependent Claim
25 words
An electrical commutator in accordance with claim 2 wherein said fingers project towards the opposing edges of said plates and substantially parallel the faces thereof.
Claim 4
Dependent Claim
29 words
An electrical commutator in accordance with claim 4 further including an armature wire positioned between said fingers and said faces and resistance welded to said fingers and said plates.
Claim 5
Dependent Claim
19 words
An electrical commutator in accordance with claim 2 wherein each of said plates has a single outwardly extending finger.
Claim 6
Dependent Claim
37 words
An electrical commutator in accordance with claim 6 wherein said composite is from 0.030 to 0.060 inches thick and wherein said aluminum and said plate is from 5 to 30 percent of the thickness and said finger.
Claim 7
Dependent Claim
21 words
An electrical commutator in accordance with claim 7 wherein said aluminum is about 10 percent of the thickness of said finger.
Claim 8
Dependent Claim
30 words
An electrical commutator in accordance with claim 5 wherein said copper contains as impurities 0.2 maximum oxygen, 0.03 percent maximum zinc, total all other impurities less than 0.03 percent nominal.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |