US2568846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of constructing electric heaters
Assignee: Cutler Hammer Inc
•
Filing: 1948-05-03
•
Granted: 1951-09-25
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Expires: 1968-05-03
Abstract
No abstract record available.
Inventors
- 👤 Irvin W Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:56
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; H05B3/52; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083; Y10T29/49087; Y10T29/49089; Y10T29/49091; Y10T409/00; Y10T409/30; Y10T409/300056
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1973629A
Cited
US2139785A
Cited
US2243823A
Cited
US2323089A
Cited
US2302808A
Cited
US2456343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |