US2539265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating system for buildings and structures
Assignee: DULRAE Ltd
•
Filing: 1946-12-04
•
Granted: 1951-01-23
•
Expires: 1966-12-04
Abstract
No abstract record available.
Inventors
- 👤 Musgrave Joseph Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:36
CPC Classifications
F; F24; F24D; F24D13/00; F24D13/02; Y; Y02; Y02B; Y02B30/00; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL34937C
Cited
US1741562A
Cited
GB393304A
Cited
GB447453A
Cited
US2243506A
Cited
US2328666A
Cited
US2378801A
Cited
US2393100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |