US2838643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic temperature control for electric heaters
Assignee: Cutler Hammer Inc
•
Filing: 1954-07-02
•
Granted: 1958-06-10
•
Expires: 1974-07-02
Abstract
No abstract record available.
Inventors
- 👤 William H Elliot
- 👤 Edwin X Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:20
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/2451; G05D23/2456
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1994076A
Cited
US2272492A
Cited
US2440682A
Cited
US2429453A
Cited
US2511981A
Cited
US2490965A
Cited
US2585005A
Cited
US2646544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |