US3582787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobil radio telephone communications systems
Assignee: International Standard Electric Corp
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Filing: 1968-11-15
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Granted: 1971-06-01
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Expires: 1988-11-15
Abstract
Abstract A mobile radio telephone system is supplied which employs a chain or network of land-based radio stations. Different groups of service and communications channels are used by adjacent ones of the land-based radio stations. The mobile stations incorporate means to search for and distinguish between the channels so that a particular group of service and communication channels associated with a given land-based radio station are sought out and used by the mobile.
Inventors
- 👤 Jean Jacques Muller
- 👤 Michel Revel-Mouroz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:48
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/02; H04W16/12; H04W16/14; H04W88/00; H04W88/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A mobile communications system comprising a plurality of land-based radio telephone sets providing radio service channels at a plurality of different frequencies, a plurality of mobile radio-telephone sets, first and second filter means forming a part of each of said mobile radio-telephone sets, said first filter means permitting the passage of signals of two different frequencies representing the signals of first and second service channels, said second filter means permitting the passage of signals of two different frequencies representing first and second conversation channels paired in groups with the first and second service channels, and means associated with each mobile radio-telephone set to search for an available coNversation channel in a group associated with the particular service channel over which the set has received a selective call addressed to it.
Claim 2
Dependent Claim
130 words
A mobile communications system comprising a plurality of land-based radio telephone sets providing radio service channels at a plurality of different frequencies, a plurality of mobile radio-telephone sets, first and second filter means forming a part of each of said mobile radio-telephone sets, said first filter means permitting the passage of signals of two different frequencies representing the signals of first and second service channels, said second filter means permitting the passage of signals of two different frequencies representing first and second conversation channels paired in groups with the first and second service channels, and means associated with each mobile radio-telephone set to search for an available coNversation channel in a group associated with the particular service channel over which the set has received a selective call addressed to it.
Claim 3
Dependent Claim
58 words
A communications system as claimed in claim 1, in which the different service channels are marked with different marking tones, and the mobile sets are equipped with means to recognize these tones whereby they can search for an available conversation channel in the group associated with the service channel according to the tone of the said service channel.
Claim 4
Dependent Claim
47 words
A communications system as claimed in claim 1, in which the available conversation channels in the different groups are marked with different offer tones, and the mobile sets are equipped with means to recognize these tones whereby they can recognize the group associated with each service channel.
Claim 5
Dependent Claim
34 words
A communications system as claimed in claim 1, in which the order to the channels in the mobile sets is such that each service channel is followed by a group of associated conversation channels.
Claim 6
Dependent Claim
39 words
A communications system as claimed in claim 1, including paging receiver service arranged in separate zones, each service including a paging receiver attached to a single station and having built-in tuning to the radio frequency of its service channel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |