US2553875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating element
Assignee: Individual
•
Filing: 1948-06-30
•
Granted: 1951-05-22
•
Expires: 1968-06-30
Abstract
No abstract record available.
Inventors
- 👤 Harold N Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:16
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US791998A
Cited
GB190903191A
Cited
US1032267A
Cited
US1255326A
Cited
US1533292A
Cited
US1608005A
Cited
US2217296A
Cited
US2265549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |