US2219612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric reaction furnace
Assignee: Individual
•
Filing: 1938-07-14
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Granted: 1940-10-29
•
Expires: 1958-07-14
Abstract
No abstract record available.
Inventors
- 👤 Berghaus Bernhard
- 👤 Burkhardt Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:26
CPC Classifications
F; F03; F03C; F03C7/00; H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/22; H01J17/26; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/121; H01J37/00; H01J37/32; H01J37/32009; H01J37/32018
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) | 1943-10-29 | 1944-04-29 | 1944-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-29 | 1948-04-29 | 1948-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-29 | 1952-04-29 | 1952-10-29 | $7700.00 | Window Closed / Lapsed |