Patent US4485805A successfully refreshed from Google Patents.
Patent US3555424A successfully refreshed from Google Patents.
US3555424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for allocating radio link channels in mobile telephone systems
Assignee: U S Holding Co Inc
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Filing: 1967-06-21
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Granted: 1971-01-12
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Expires: 1987-06-21
Abstract
Abstract IN A MOBILE TELEPHONE SYSTEM, ALL IDLE CHANNELS ARE MARKED, AND EACH MOBILE STATION LINES UP ON ANY IDLE MARKED CHANNEL. CALLED NUMBER CODES ARE SENT SIMULTANEOUSLY OVER ALL IDLE CHANNELS. ANY MOBILE RECOGNIZING ITS CODE RETURNS AN ANSWER TONE, AND THE IDLE MARKING TONE IS REMOVED. WHEN THE TONE DISAPPEARS, ALL MOBILES ON THAT CHANNEL MOVE OFF IN SEARCH OF ANOTHER IDLE MARKING. THE MOBILE STATION INCLUDES A PAYSTATION.
Inventors
- 👤 Marvin F Malm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:06
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |