Patent US2991388A successfully refreshed from Google Patents.
US2991388A
Expired / Lapsed
US
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Display devices employing glow discharge tubes
Assignee: Ericsson Telephones Ltd
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Filing: 1959-07-01
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Granted: 1961-07-04
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Expires: 1979-07-01
Abstract
No abstract record available.
Inventors
- 👤 Colin J Wightman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:54
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J2893/00; H01J2893/0069
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2142106A
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US2769939A
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US2618760A
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US2756366A
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US2898500A
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US2874320A
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US2878407A
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US2906906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |