Patent US3997731A successfully refreshed from Google Patents.
US3997731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for custom calling features in a telephone system
Assignee: Nokia of America Corp
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Filing: 1975-04-14
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Granted: 1976-12-14
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Expires: 1995-04-14
Abstract
Abstract Disclosed is an arrangement of circuits for providing what is normally called Custom Calling or Special Services features such as signalling and switching for a call waiting or three-way calling. The apparatus shown may provide either feature or may provide both services by the selection and insertion of one of three available circuits. A plurality of common circuits are provided to operate with specific electronic logic circuits for call waiting, three-way calling or both. Circuits are plug-in PC boards using integrated circuit logic. Individual plug-in cards are provided--one for the call waiting feature, another for three-way calling and a third card is used to provide both features. The entire apparatus may be connected to the subscriber lines and to the central office equipment at the main distributing frame thereby requiring no internal wiring or circuit changes in the central office.
Inventors
- 👤 Charles David Wilmot
- 👤 William Lee Webb
- 👤 Kervyn George Collyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:36
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/48; Y; Y10; Y10S; Y10S379/00; Y10S379/909
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
Apparatus for providing special service features of a first, or second or first and second type for a telephone system wherein said apparatus may be provided for a telephone station and line having access to said telephone system through an intermediate distributing interconnection, said apparatus including means insertable into said system at said interconnection to provide services to the line to which connected, said apparatus including a control circuit interfacing between said line and line equipment in said system, said control circuit including a plurality of control conductors, a first circuit for providing said first type of special sevice feature, a second circuit for providing said second type of service, and a third circuit for providing both said first and said second type of service, and plural conductors in each of said first, second and third circuits to be connected in the alternative to said control circuit conductors to provide type or types of service indicated by the connected first, second or third circuit.
Claim 2
Dependent Claim
164 words
Apparatus for providing special service features of a first, or second or first and second type for a telephone system wherein said apparatus may be provided for a telephone station and line having access to said telephone system through an intermediate distributing interconnection, said apparatus including means insertable into said system at said interconnection to provide services to the line to which connected, said apparatus including a control circuit interfacing between said line and line equipment in said system, said control circuit including a plurality of control conductors, a first circuit for providing said first type of special sevice feature, a second circuit for providing said second type of service, and a third circuit for providing both said first and said second type of service, and plural conductors in each of said first, second and third circuits to be connected in the alternative to said control circuit conductors to provide type or types of service indicated by the connected first, second or third circuit.
Claim 3
Dependent Claim
20 words
An apparatus as claimed in claim 1, in which said control circuit includes a relay for each of said conductors.
Claim 4
Dependent Claim
53 words
An apparatus as claimed in claim 2, wherein said line has two line appearances assigned thereto at said line equipment, and means in said apparatus for holding a first call to said line over one of said line appearances while a second call through said system is attempted over the other line appearance.
Claim 5
Dependent Claim
43 words
An apparatus as claimed in claim 3, wherein the first of said types of service is call waiting service, said first and third logic circuits include means for initiating a hold condition on one of said calls over either of the line appearances.
Claim 6
Dependent Claim
41 words
An apparatus as claimed in claim 4 wherein the second of said types of service features is a three-way calling service, and said second and third logic circuits provide circuits for holding one of said calls over only one line appearance.
Claim 7
Dependent Claim
145 words
In a telephone system, apparatus for providing a plurality of special services to a line having a normal line appearance, and a special services line appearance with a sleeve lead for said special line appearance, means in said apparatus responsive to a seizing signal received over said second appearance for determining which of said services is desired responsive to said seizing signal, comprising first circuit means for delaying receipt of said seizing signal over said sleeve lead to said first circuit means for a predetermined period, means operative at the end of said period for sensing the condition of said sleeve lead wherein a first condition of said sleeve lead signifies one special service and a second condition signifies another special service, and a circuit member responsive to the condition sensed for actuating certain circuit members and certain output leads to implement the selected service.
Claim 8
Dependent Claim
145 words
In a telephone system, apparatus for providing a plurality of special services to a line having a normal line appearance, and a special services line appearance with a sleeve lead for said special line appearance, means in said apparatus responsive to a seizing signal received over said second appearance for determining which of said services is desired responsive to said seizing signal, comprising first circuit means for delaying receipt of said seizing signal over said sleeve lead to said first circuit means for a predetermined period, means operative at the end of said period for sensing the condition of said sleeve lead wherein a first condition of said sleeve lead signifies one special service and a second condition signifies another special service, and a circuit member responsive to the condition sensed for actuating certain circuit members and certain output leads to implement the selected service.
Claim 9
Dependent Claim
19 words
In a telephone system, the apparatus of claim 6, wherein said condition sensing circuit member comprises a bi-stable device.
References Cited (Backward Citations)
US3755630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |