US2518807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating element
Assignee: DULRAE Ltd
•
Filing: 1947-04-16
•
Granted: 1950-08-15
•
Expires: 1967-04-16
Abstract
No abstract record available.
Inventors
- 👤 Musgrave Joseph Leslie
- 👤 Lewis Douglas Gastrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:00
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1077635A
Cited
DE432057C
Cited
US853784A
Cited
US1153703A
Cited
US1123225A
Cited
US1119838A
Cited
US1241578A
Cited
US1996522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |