US2689900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for heat treating metallic objects
Assignee: Westinghouse Electric Corp
•
Filing: 1950-05-05
•
Granted: 1954-09-21
•
Expires: 1970-05-05
Abstract
No abstract record available.
Inventors
- 👤 John A Redmond
- 👤 William L Corteggiano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:10
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2623176A
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US2590546A
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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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |