Patent US3102976A successfully refreshed from Google Patents.
US3102976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding circuitry
Assignee: Helfrecht Machine Co
•
Filing: 1961-02-06
•
Granted: 1963-09-03
•
Expires: 1981-02-06
Abstract
No abstract record available.
Inventors
- 👤 Robert H Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:57
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/241
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A POWER SUPPLY SYSTEM COMPRISING THREE-PHASE Y-CONNECTED AUTORANSFORMER MEANS SECOND TRANSFORMER MEANS, SAID SECOND TRANSFORMER MEANS INCLUDING PRIMARY COIL MEANS AND SECONDARY COIL MEANS, SAID PRIMARY COIL MEANS BEING DELTA-CONNECTED AND SAID SECONDARY COIL MEANS BEING Y-CONNECTED, THE OUTPUT OF SAID AUTOTRANSFORMER MEANS BEING CONNECTED TO THE PRIMARY COIL MEANS OF SAID SECOND TRANSFORMER MEANS, SILICON RECTIFIER MEANS, THE OUTPUT OF SAID SECONDARY COIL MEANS OF SAID SECOND TRANSFORMER MEANS BEING CONNECTED TO SAID SILICON RECTIFIER MEANS, AND DELTA-CONNECTED UNLOADED TERTIARY COILS IN AT LEAST ONE OF A SAID TRANSFORMER MEANS FOR SHORT CIRCUITING THIRD AND RELATED HARMONIC COMPONENTS.
Claim 2
Dependent Claim
99 words
A POWER SUPPLY SYSTEM COMPRISING THREE-PHASE Y-CONNECTED AUTORANSFORMER MEANS SECOND TRANSFORMER MEANS, SAID SECOND TRANSFORMER MEANS INCLUDING PRIMARY COIL MEANS AND SECONDARY COIL MEANS, SAID PRIMARY COIL MEANS BEING DELTA-CONNECTED AND SAID SECONDARY COIL MEANS BEING Y-CONNECTED, THE OUTPUT OF SAID AUTOTRANSFORMER MEANS BEING CONNECTED TO THE PRIMARY COIL MEANS OF SAID SECOND TRANSFORMER MEANS, SILICON RECTIFIER MEANS, THE OUTPUT OF SAID SECONDARY COIL MEANS OF SAID SECOND TRANSFORMER MEANS BEING CONNECTED TO SAID SILICON RECTIFIER MEANS, AND DELTA-CONNECTED UNLOADED TERTIARY COILS IN AT LEAST ONE OF A SAID TRANSFORMER MEANS FOR SHORT CIRCUITING THIRD AND RELATED HARMONIC COMPONENTS.
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) | 1966-09-02 | 1967-03-04 | 1967-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-02 | 1971-03-04 | 1971-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-02 | 1975-03-04 | 1975-09-03 | $7700.00 | Window Closed / Lapsed |