US2513315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio position determining system
Assignee: Seismograph Service Corp
•
Filing: 1947-10-09
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Granted: 1950-07-04
•
Expires: 1967-10-09
Abstract
No abstract record available.
Inventors
- 👤 James E Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:33
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/30; G01S1/304
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1942262A
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US2148267A
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US2141281A
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US2144203A
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US2407287A
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US2408773A
Cited
US2423305A
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US2417807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |