US2428899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating element
Assignee: Edwin L Wiegand Co
•
Filing: 1940-10-21
•
Granted: 1947-10-14
•
Expires: 1960-10-21
Abstract
No abstract record available.
Inventors
- 👤 Edwin L Wiegand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:39
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/76; H01; H01B; H01B7/00; H01B7/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US905045A
Cited
US1019426A
Cited
US1174548A
Cited
US1613426A
Cited
US1705696A
Cited
US1835602A
Cited
US1985965A
Cited
GB418155A
Cited
US2157884A
Cited
US2094480A
Cited
GB484148A
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 |