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Patent US2703355A successfully refreshed from Google Patents.
US2703355A
Expired / Lapsed
US
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Electric heater
Assignee: Kanthal Corp
•
Filing: 1950-10-23
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Granted: 1955-03-01
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Expires: 1970-10-23
Abstract
No abstract record available.
Inventors
- 👤 Hagglund Erik Haiji Mattiasson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:03
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US859608A
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US1359400A
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AT147151B
Cited
US2019686A
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US2191790A
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US2403926A
Cited
GB583807A
Cited
US2387980A
Cited
US2460590A
Cited
US2533736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-28 | 1958-08-30 | 1959-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-28 | 1962-08-30 | 1963-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-28 | 1966-08-30 | 1967-03-01 | $7700.00 | Window Closed / Lapsed |