Patent US2097981A successfully refreshed from Google Patents.
US2097981A
Expired / Lapsed
US
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Immersion heater for salt baths
Assignee: FIRM DEUTSCHE GOLD und SILBER
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Filing: 1935-09-03
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Granted: 1937-11-02
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Expires: 1955-09-03
Abstract
No abstract record available.
Inventors
- 👤 Karcher Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:22
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-11-01 | 1941-05-03 | 1941-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-11-01 | 1945-05-03 | 1945-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-11-01 | 1949-05-03 | 1949-11-02 | $7700.00 | Window Closed / Lapsed |