Patent US2447649A successfully refreshed from Google Patents.
US2447649A
Expired / Lapsed
US
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Electric heating apparatus and control
Assignee: Westinghouse Electric Corp
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Filing: 1942-09-24
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Granted: 1948-08-24
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Expires: 1962-09-24
Abstract
No abstract record available.
Inventors
- 👤 John W Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:42
CPC Classifications
B; B23; B23K; B23K3/00; B23K3/02; B23K3/03; B23K3/033
Claims Analysis
Total Claims: 0
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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) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |