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US2818502A
Expired / Lapsed
US
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Transponder system
Assignee: Individual
•
Filing: 1946-10-23
•
Granted: 1957-12-31
•
Expires: 1966-10-23
Abstract
No abstract record available.
Inventors
- 👤 Malcolm H Steward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:12
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/767
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR902415A
Cited
US2415359A
Cited
US2429513A
Cited
US2444721A
Cited
US2414922A
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US2530096A
Cited
US2592777A
Cited
US2654833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |