Patent US2190069A successfully refreshed from Google Patents.
US2190069A
Expired / Lapsed
US
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Space discharge device
Assignee: Radio Patents Corp
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Filing: 1937-04-14
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Granted: 1940-02-13
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Expires: 1957-04-14
Abstract
No abstract record available.
Inventors
- 👤 Hollmann Hans Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:31
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/02; H01J31/04; H01J21/00; H01J21/02; H01J21/06; H01J21/10; H01J21/12; H01J2893/00; H01J2893/0032
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) | 1943-02-12 | 1943-08-14 | 1944-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-12 | 1947-08-14 | 1948-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-12 | 1951-08-14 | 1952-02-13 | $7700.00 | Window Closed / Lapsed |