Patent US2158493A successfully refreshed from Google Patents.
US2158493A
Expired / Lapsed
US
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Artificial line for use on radio and other high frequencies
Assignee: RCA Corp
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Filing: 1936-03-16
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Granted: 1939-05-16
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Expires: 1956-03-16
Abstract
No abstract record available.
Inventors
- 👤 Brailsford Joseph Douglas
- 👤 O'neill Robert Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:08
CPC Classifications
H; H03; H03H; H03H5/00; H03H5/003; H01; H01F; H01F17/00; H01F17/04; H01F21/00; H01F21/02; H01F21/10
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) | 1942-05-15 | 1942-11-14 | 1943-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-15 | 1946-11-14 | 1947-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-15 | 1950-11-14 | 1951-05-16 | $7700.00 | Window Closed / Lapsed |