Patent US2541039A successfully refreshed from Google Patents.
US2422734A
Expired / Lapsed
US
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Device for regulating the temperature of electric furnaces of the resistance type
Assignee: Individual
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Filing: 1940-05-11
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Granted: 1947-06-24
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Expires: 1960-05-11
Abstract
No abstract record available.
Inventors
- 👤 Jung Erwin Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:33
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/22; G05D23/1927; G05D23/193; G05D23/1931
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1391996A
Cited
US1664965A
Cited
US1815061A
Cited
US1985967A
Cited
US1893847A
Cited
US2015838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-23 | 1950-12-23 | 1951-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-23 | 1954-12-23 | 1955-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-23 | 1958-12-23 | 1959-06-24 | $7700.00 | Window Closed / Lapsed |