US2589808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transpondor system
Assignee: Hazeltine Research Inc
•
Filing: 1946-10-21
•
Granted: 1952-03-18
•
Expires: 1966-10-21
Abstract
No abstract record available.
Inventors
- 👤 Charles J Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/78; G01S5/00; G01S5/02; G01S5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2405238A
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US2403600A
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US2426218A
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US2427220A
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US2495737A
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US2448016A
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US2480123A
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US2433341A
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US2449977A
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US2483097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |