US2568538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction finder
Assignee: Marconis Wireless Telegraph Co Ltd
•
Filing: 1948-07-16
•
Granted: 1951-09-18
•
Expires: 1968-07-16
Abstract
No abstract record available.
Inventors
- 👤 Brailsford Joseph Douglas
- 👤 Vass Eric Burnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:05
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S3/00; G01S3/02; G01S3/14; G01S3/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2002430A
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US2007477A
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US2017909A
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US2169742A
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US2271550A
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US2198445A
Cited
US2213842A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |