US3249735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc welding systems
Assignee: BRITISH WELDING RES ASS
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Filing: 1963-07-29
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Granted: 1966-05-03
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 Needham James Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:27
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/10; B23K9/1006; B23K9/09; B23K9/091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
AN ARC SYSTEM UTILIZING A NON-LINEAR EFFECT OF ARC OPERATION WHICH OCCURS SIGNIFICANTLY ONLY ABOVE A GIVEN ARC CURRENT VALUE, SAID SYSTEM INCLUDING A FIRST ELECTRODE, A WORKPIECE FORMING A SECOND ELECTRODE SEPARATED FROM SAID FIRST ELECTRODE BY AN ARC SPACE, A POWER SOURCE, A FIRST IMPEDANCE CONNECTED IN SERIES WITH THE POWER SOURCE TO PROVIDED IN SAID ARC SPACE AN ARC-MAINTAINING CURRENT LOWER THAN THE SAID VALUE, A FURTHER IMPEDANCE IN PARALLEL DEVICE CONNECTED IN SERIES WITH THE SAID FURTHER IMPEDANCE, THE SWITCHING DEVICE BEING ARRANGED TO OPERATE CYCLICALLY TO CONNECT THE SAID FURTHER IMPEDEANCE IN PARALLEL WITH SAID FIRST IMPEDANCE, WHEREBY THE SAID ARC-MAINTAINING CURRENT FLOWING THROUGH THE FIRST IMPEDANCE WHEN, THE SWITCHING DEVICE IS NOT OPERATED, IS SUPPLEMENTED WHEN THE SWITCHING DEVICE IS OPERATED, BY CURRENT FLOWING THROUGH THE SAID FURTHER IMPEDANCE TO RAISE THE TOTAL ARC CURRENT HIGHER THAN THE SAID VALUE, SAID SWITCHING DEVICE BEING IN ITS OPERATED CONDITION FOR A PERIOD OF EACH CYCLE SUCH THAT THE MEANS CURRENT VALUE IS CLOSER TO THE LOWER CURRENT VALUE THAN THE HIGHER CURRENT VALUE.
Claim 2
Dependent Claim
178 words
AN ARC SYSTEM UTILIZING A NON-LINEAR EFFECT OF ARC OPERATION WHICH OCCURS SIGNIFICANTLY ONLY ABOVE A GIVEN ARC CURRENT VALUE, SAID SYSTEM INCLUDING A FIRST ELECTRODE, A WORKPIECE FORMING A SECOND ELECTRODE SEPARATED FROM SAID FIRST ELECTRODE BY AN ARC SPACE, A POWER SOURCE, A FIRST IMPEDANCE CONNECTED IN SERIES WITH THE POWER SOURCE TO PROVIDED IN SAID ARC SPACE AN ARC-MAINTAINING CURRENT LOWER THAN THE SAID VALUE, A FURTHER IMPEDANCE IN PARALLEL DEVICE CONNECTED IN SERIES WITH THE SAID FURTHER IMPEDANCE, THE SWITCHING DEVICE BEING ARRANGED TO OPERATE CYCLICALLY TO CONNECT THE SAID FURTHER IMPEDEANCE IN PARALLEL WITH SAID FIRST IMPEDANCE, WHEREBY THE SAID ARC-MAINTAINING CURRENT FLOWING THROUGH THE FIRST IMPEDANCE WHEN, THE SWITCHING DEVICE IS NOT OPERATED, IS SUPPLEMENTED WHEN THE SWITCHING DEVICE IS OPERATED, BY CURRENT FLOWING THROUGH THE SAID FURTHER IMPEDANCE TO RAISE THE TOTAL ARC CURRENT HIGHER THAN THE SAID VALUE, SAID SWITCHING DEVICE BEING IN ITS OPERATED CONDITION FOR A PERIOD OF EACH CYCLE SUCH THAT THE MEANS CURRENT VALUE IS CLOSER TO THE LOWER CURRENT VALUE THAN THE HIGHER CURRENT VALUE.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |