Patent US2212643A successfully refreshed from Google Patents.
US2212643A
Expired / Lapsed
US
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Discharge tube for keeping voltages constant
Assignee: STABILOVOLT GmbH
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Filing: 1936-08-22
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Granted: 1940-08-27
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Expires: 1956-08-22
Abstract
No abstract record available.
Inventors
- 👤 Koros Ladislaus
- 👤 Toennies Jan Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:26
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/40; H01J17/42; H01J17/02; H01J17/30
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) | 1943-08-27 | 1944-02-26 | 1944-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-27 | 1948-02-26 | 1948-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-27 | 1952-02-26 | 1952-08-27 | $7700.00 | Window Closed / Lapsed |