US2824987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron optical elements and systems equivalent to light optical prisms for charge carriers in discharge vessels
Assignee: Ernst Leitz Wetzlar GmbH
•
Filing: 1953-05-05
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Granted: 1958-02-25
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Expires: 1973-05-05
Abstract
No abstract record available.
Inventors
- 👤 Weissenberg Gustav
- 👤 Bartz Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:49
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/28; C07D213/30; H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J29/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2636999A
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US1779794A
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US2211613A
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US2249041A
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US2429558A
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US2460402A
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US2473477A
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US2531050A
Cited
US2544718A
Cited
US2615128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |