US1603468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the insulation of vacuum tubes
Assignee: Siemens and Halske AG
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Filing: 1922-10-19
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Granted: 1926-10-19
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Expires: 1942-10-19
Abstract
No abstract record available.
Inventors
- 👤 Jaeger Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:46
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/42; H01J19/44
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) | 1929-10-18 | 1930-04-19 | 1930-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-10-18 | 1934-04-19 | 1934-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-10-18 | 1938-04-19 | 1938-10-19 | $7700.00 | Window Closed / Lapsed |