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US3710033A
Expired / Lapsed
US
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Call forwarding arrangement for telephone systems
Assignee: Individual
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Filing: 1971-06-11
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Granted: 1973-01-09
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Expires: 1991-06-11
Abstract
Abstract A call forwarding arrangement, which is particularly applicable in connection with telephone exchanges having a relatively few call forwarding customers, utilizes a group of selectable call forwarding circuits together with selectable memory devices which are used only while the call forwarding line is in the transfer condition. A crossbar link circuit is utilized in conjunction with the group of selected call forwarding circuits, each call forwarding line having a vertical appearance on the crossbar switch of the link circuit while the call forwarding circuits of the group are connected to the horizontals. No modifications of the existing central office equipment are involved; all facilities of the CF service being added as auxiliary equipment.
Inventors
- 👤 W Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:30
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
165 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, means for providing call forwarding service for said subscriber station including an auxiliary line circuit connected between said subscriber station and said regular line circuit, a group of selectable call forwarding circuits, a call forwarding link circuit for connecting a selected one of said call forwarding circuits to said auxiliary line circuit and between said subscriber station and said regular line circuit on each originating call as the station goes off-hook, means effective upon dialing a first predetermined special number for initiating call transfer, means effective upon completion of the dialing of a regular number for disconnecting said selected call forwarding circuit, a group of selectable call forwarding registers, a group of selectable call forwarding memories, and means following connection of said selected call forwarding circuit for selecting and connecting to said call forwarding circuit a respective one of said registers and a respective one of said memories.
Claim 2
Dependent Claim
165 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, means for providing call forwarding service for said subscriber station including an auxiliary line circuit connected between said subscriber station and said regular line circuit, a group of selectable call forwarding circuits, a call forwarding link circuit for connecting a selected one of said call forwarding circuits to said auxiliary line circuit and between said subscriber station and said regular line circuit on each originating call as the station goes off-hook, means effective upon dialing a first predetermined special number for initiating call transfer, means effective upon completion of the dialing of a regular number for disconnecting said selected call forwarding circuit, a group of selectable call forwarding registers, a group of selectable call forwarding memories, and means following connection of said selected call forwarding circuit for selecting and connecting to said call forwarding circuit a respective one of said registers and a respective one of said memories.
Claim 3
Dependent Claim
64 words
In a telephone communication system including a subscriber station and a regular line circuit for said subscriber station, the combination defined by claim 1 further characterized in means including a high impedance pulse detector connectable to said selected call forwarding circuit and effective as a number is dialed for causing registration of the digits in said respective one of said selectable call forwarding registers.
Claim 4
Dependent Claim
84 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 2 further characterized in additional means including a low resistance pulsing relay, and means for disconnecting said high impedance pulse detector means from said selected call forwarding circuit and for connecting said additional means thereto, said additional means also being effective as a number is dialed for causing registration of the digits in said respective one of said selectable call forwarding registers.
Claim 5
Dependent Claim
79 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 3 further characterized in means effective following the dialing of said first predetermined special number and completion of the dialing of a transfer number for causing the number registered in said respective one of said selectable call forwarding registers to be transferred to said Respective one of said memories and stored therein for a predetermined time interval.
Claim 6
Dependent Claim
68 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 4 further characterized in means effective following response to a call to the transfer station by going off-hook and a return to on-hook condition at said subscriber station to validate a transfer condition whereby calls incoming to said subscriber station are forwarded to the transfer station.
Claim 7
Dependent Claim
130 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 5 further characterized in means effective following a failure to respond to the transfer call by the transfer station and upon redialing of said first predetermined special number and completion of the redialing of the transfer number before expiration of said predetermined time interval for comparing for possible match the number stored in said one of said memories and the number stored in the selected one of said call forwarding registers during the redialing of the transfer number, a first relay operated upon indication of a match between the two numbers, and a second relay operated upon indication of a failure of a match between the two numbers.
Claim 8
Dependent Claim
74 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 6 further characterized in a source of OK tone, a source of reorder tone, means effective upon operation of said first relay for connecting said source of OK tone to said selected call forwarding circuit and means effective upon operation of said second relay for connecting said source of reorder tone thereto.
Claim 9
Dependent Claim
55 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 7 further characterized in means effected by dialing a second predetermined special number differing from said first special number for cancelling a validated transfer condition, said last mentioned means including a third relay.
Claim 10
Dependent Claim
48 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 8 further characterized in that operation of said third relay is also effective to connect said source of OK tone to said selected call forwarding circuit.
Claim 11
Dependent Claim
68 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 9 further characterized by a source of special dial tone, a fourth relay effective upon operation to connect said source of special dial tone to said selected call forwarding circuit, and means following the dialing of said first predetermined special number for operating said fourth relay.
Claim 12
Dependent Claim
44 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 10 further characterized in additional means for operating said fourth relay, said additional means being effected by operation of said third relay.
Claim 13
Dependent Claim
92 words
In a telephone communication system including a subscriber station and a regular line circuit for said station, the combination defined by claim 11 further characterized in a release relay effective when operated to return operated elements of the call forwarding service providing means to normal condition, a first operating path and a second operating path for said release relay, means effected by operation of said fourth relay for opening the first of said operating paths, and additional means effected by operation of said third relay for closing the second of said paths.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |