US3115568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric arc cutting
Assignee: Airco Inc
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Filing: 1961-09-25
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Granted: 1963-12-24
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Expires: 1981-09-25
Abstract
No abstract record available.
Inventors
- 👤 Paul R Blackman
- 👤 Craig R Sibley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:54
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
THE METHOD OF CUTTING METALS WHICH COMPRISES TRAVERSING A BARE CONSUMABLE ELECTRODE AND A WORKPIECE AT A PREDETERMINED CUTTING SPEED RELATIVELY TO ONE ANOTHER ALONG A DESIRED LINE OF SECTION IN SAID WORKPIECE, PRODUCING RAPIDLY RECURRING CURRENT SURGES PRODUCTIVE OF INTERMITTENT ARCING BETWEEN SAID ELECTRODE AND SAID WORKPIECE BY DIRECTLY CONNECTING SAID ELECTRODE AND SAID WORKPIECE IN CIRCUIT WITH A SOURCE OF ALTERNATING CURRENT OF CONSTANT VOLTAGE WHOSE VALUE IS CAPABLE ONLY OF MOMENTARILY SUSTAINING AN ARC ACROSS THE GAPS FORMED BETWEEN SAID ELECTRODE AND SAID WORKPIECE BY METAL PROGRESSIVELY MELTED AND EXPELLED THEREFROM BY SAID CURRENT SURGES AND WHICH CONSEQUENTLY PRODUCES BETWEEN SAID ELECTRODE AND SAID WORKPIECE AT SAID PREDETERMINED CUTTING SPEED FREQUENT SHORT CIRCUITS AND PERIODS WHEN THE ARC IS EXTINGUISHED, AND FEEDING SAID ELECTRODE TOWARDS SAID WORKPIECE AT A RATE SUCH THAT AN ARCING PORTION OF SAID ELECTRODE IS MAINTAINED WITHIN THE KERF FORMED IN SAID WORKPIECE BY THE METAL PROGRESSIVELY MELTED FROM SAID WORKPIECE BY SAID CURRENT SURGES.
Claim 2
Independent Claim
162 words
THE METHOD OF CUTTING METALS WHICH COMPRISES TRAVERSING A BARE CONSUMABLE ELECTRODE AND A WORKPIECE AT A PREDETERMINED CUTTING SPEED RELATIVELY TO ONE ANOTHER ALONG A DESIRED LINE OF SECTION IN SAID WORKPIECE, PRODUCING RAPIDLY RECURRING CURRENT SURGES PRODUCTIVE OF INTERMITTENT ARCING BETWEEN SAID ELECTRODE AND SAID WORKPIECE BY DIRECTLY CONNECTING SAID ELECTRODE AND SAID WORKPIECE IN CIRCUIT WITH A SOURCE OF ALTERNATING CURRENT OF CONSTANT VOLTAGE WHOSE VALUE IS CAPABLE ONLY OF MOMENTARILY SUSTAINING AN ARC ACROSS THE GAPS FORMED BETWEEN SAID ELECTRODE AND SAID WORKPIECE BY METAL PROGRESSIVELY MELTED AND EXPELLED THEREFROM BY SAID CURRENT SURGES AND WHICH CONSEQUENTLY PRODUCES BETWEEN SAID ELECTRODE AND SAID WORKPIECE AT SAID PREDETERMINED CUTTING SPEED FREQUENT SHORT CIRCUITS AND PERIODS WHEN THE ARC IS EXTINGUISHED, AND FEEDING SAID ELECTRODE TOWARDS SAID WORKPIECE AT A RATE SUCH THAT AN ARCING PORTION OF SAID ELECTRODE IS MAINTAINED WITHIN THE KERF FORMED IN SAID WORKPIECE BY THE METAL PROGRESSIVELY MELTED FROM SAID WORKPIECE BY SAID CURRENT SURGES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-23 | 1967-06-24 | 1967-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-23 | 1971-06-24 | 1971-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-23 | 1975-06-24 | 1975-12-24 | $7700.00 | Window Closed / Lapsed |