US3689731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance welding electrode
Assignee: Motors Liquidation Co
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Filing: 1971-09-07
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Granted: 1972-09-05
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Expires: 1991-09-07
Abstract
Abstract A spot welding electrode composed of a low resistivity copper alloy has a peripheral slot near the tip to concentrate current flow in the central portion of the electrode. The slot contains a high resistivity steel support material to lend strength to the electrode.
Inventors
- 👤 William K Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:48
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/30; B23K11/3009; B23K35/00; B23K35/02; B23K35/0205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A resistance spotwelding electrode having high resistance to deformation and erosion comprising a body portion composed of a high conductivity material and terminating in a work-contacting face composed wholly of the same material as the body, and means for concentrating the flow of welding current in the central portion of the face comprising an annular peripheral slot spaced from the face and a support member within the slot composed of low conductivity material whereby the radially outer portion of the face maintains high strength and a low temperature relative to the central portion.
Claim 2
Dependent Claim
97 words
A resistance spot welding electrode having high resistance to deformation and erosion comprising a body portion composed of a high conductivity copper alloy material and terminating in a work contacting face composed wholly of the same material as the body, and means for concentrating the flow of welding current in the central portion of the face comprising an annular peripheral slot spaced from the face and a support member within the slot composed of low conductivity steel whereby the radially outer portion of the face maintains high strength and a low temperature relative to the central portion.
References Cited (Backward Citations)
US2250645A
Cited
US3592994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |