US2428900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating element
Assignee: Edwin L Wiegand Co
•
Filing: 1941-04-25
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Granted: 1947-10-14
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Expires: 1961-04-25
Abstract
No abstract record available.
Inventors
- 👤 Edwin L Wiegand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:04
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/16; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49089
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1359400A
Cited
US1835602A
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US1959776A
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US1960221A
Cited
US2157884A
Cited
US2094480A
Cited
US2243823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |