US2550843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating unit
Assignee: Edwin L Wiegand Co
•
Filing: 1945-02-12
•
Granted: 1951-05-01
•
Expires: 1965-02-12
Abstract
No abstract record available.
Inventors
- 👤 Mcorlly Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:30
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US933622A
Cited
US1597900A
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US2119680A
Cited
US2180600A
Cited
US2286161A
Cited
US2413477A
Cited
US2370767A
Cited
US2357150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |