US2847554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1957-07-05
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Granted: 1958-08-12
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Expires: 1977-07-05
Abstract
No abstract record available.
Inventors
- 👤 John W Huffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:15
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/275; G05D23/27535; G05D23/2754; A; A47; A47J; A47J37/00; A47J37/10; A47J37/105; H; H01; H01H; H01H37/00; H01H37/02; H01H37/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1680398A
Cited
US2005584A
Cited
US2409420A
Cited
US2410013A
Cited
US2611855A
Cited
US2744995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |