US2523315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective calling system
Assignee: Farnsworth Research Corp
•
Filing: 1947-06-06
•
Granted: 1950-09-26
•
Expires: 1967-06-06
Abstract
No abstract record available.
Inventors
- 👤 Louis F Mayle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:43
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022; H04W88/025; H04W88/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1740833A
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GB433286A
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US2255162A
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US2300081A
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US2325829A
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US2340798A
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US2361585A
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US2361653A
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US2368778A
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US2392672A
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US2457730A
Cited
US2417112A
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US2431167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |