Patent US1469075A successfully refreshed from Google Patents.
US1469075A
Expired / Lapsed
US
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Electron-discharge apparatus
Assignee: General Electric Co
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Filing: 1921-03-23
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Granted: 1923-09-25
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Expires: 1941-03-23
Abstract
No abstract record available.
Inventors
- 👤 Harry E Dunham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:22
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/163
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) | 1926-09-24 | 1927-03-26 | 1927-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-09-24 | 1931-03-26 | 1931-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-09-24 | 1935-03-26 | 1935-09-25 | $7700.00 | Window Closed / Lapsed |