Patent US3247501A successfully refreshed from Google Patents.
US3247501A
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Electric power monitoring system particularly for electric resistance welders
Assignee: Taylor Winfield Corp
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Filing: 1961-09-20
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Granted: 1966-04-19
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Expires: 1981-09-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Riley
- 👤 Emmanuel V Dethier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:36
CPC Classifications
H; H03; H03M; H03M1/00; B; B23; B23K; B23K11/00; B23K11/24; B23K11/248; G; G01; G01G; G01G11/00; G01G11/14; G01G11/16; G01G11/18; G01G23/00; G01G23/18; G01G23/36; G01G23/37; G06; G06G; G06G7/00; G06G7/12; G06G7/16; G06G7/161; G06G7/18; G06G7/184; G06G7/186; G06J; G06J1/00; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/1209; H03K; H03K7/00; H03K7/06; H03M1/66; H03M1/86
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
51 words
IN APPARATUS FOR MONITORING THE OPERATION OF IGNITRONS USED TO CONTROL THE TRANLATION OF ALTERNATING CURRENT TO AN INDUCTIVE LOAD SUCH AS A RESISTANCE WELDING TRANSFORMER AND WHEREIN A SIGNAL IS EMPLOYED TO INDICATE MISOPERATION OF AN IGNITRON THE IMPROVEMENT COMPRISING MEANS CONNECTED WITH THE INPUT TERMINALS OF SAID LOAD TO
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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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |