Patent US3567867A successfully refreshed from Google Patents.
US3567867A
Expired / Lapsed
US
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Supervisory lamp system for telephone conference connection and call transfer devices
Assignee: RICE MULTIPHONES Inc
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Filing: 1969-09-30
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Granted: 1971-03-02
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Expires: 1989-09-30
Abstract
Abstract A supervisory lamp system for use in conjunction with a conference connection and call transfer device for effecting call transfer or conference connection between two or more mutually remote telephone subscribers at a subscriber station having a plurality of telephone circuit subscriber lines is described. Connection of or ''''seizing'''' of any of the interconnected lines is signalled by the lighting of an associated supervisory lamp at the controlling subscriber station, which supervisory lamp automatically goes out upon disconnect effected by ''''hanging up'''' of the associated remote subscriber set. When setting up conference connection between two or more remote subscriber stations without monitoring at the controlling subscriber station, accidental actuation of disconnect switches at the controlling station is prevented by having said switches arranged within the cradle of the controlling subscriber desk set in such a manner that when the handset portion is placed upon the cradle, said switches are protectively covered.
Inventors
- 👤 Charles F Rice
- 👤 Charles Kimtantas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:49
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
214 words
In a supervisory lamp system for a combination telephone conference connection and call transfer device for use at a telephone subscriber station having a plurality of subscriber lines thereto from a telephone system exchange, and a telephone set equipment, the combination comprising, transformer means for inductively coupling said subscriber lines and having a plurality of electrical windings, one for each of said subscriber lines, circuit means for each of said subscriber lines for interconnecting said subscriber lines in series with one each of said plurality of windings, normally nonconductive solid state switch means having first and second main terminal elements in series with each of said circuit means and having a gate terminal element responsive to potential applied to said gate terminal element with respect to said second main terminal element for rendering said switch means conductive when a potential appears across said first and second main terminal elements, said switch means including means rendering it nonconductive upon a potential across said first and second main terminal elements falling either to or through zero potential, a normally deenergized supervisory lamp for each of said plurality of subscriber lines, and circuit means interconnecting said supervisory lamps with one each of said subscriber lines operative to energize the associated lamp upon its subscriber line becoming seized.
Claim 2
Dependent Claim
214 words
In a supervisory lamp system for a combination telephone conference connection and call transfer device for use at a telephone subscriber station having a plurality of subscriber lines thereto from a telephone system exchange, and a telephone set equipment, the combination comprising, transformer means for inductively coupling said subscriber lines and having a plurality of electrical windings, one for each of said subscriber lines, circuit means for each of said subscriber lines for interconnecting said subscriber lines in series with one each of said plurality of windings, normally nonconductive solid state switch means having first and second main terminal elements in series with each of said circuit means and having a gate terminal element responsive to potential applied to said gate terminal element with respect to said second main terminal element for rendering said switch means conductive when a potential appears across said first and second main terminal elements, said switch means including means rendering it nonconductive upon a potential across said first and second main terminal elements falling either to or through zero potential, a normally deenergized supervisory lamp for each of said plurality of subscriber lines, and circuit means interconnecting said supervisory lamps with one each of said subscriber lines operative to energize the associated lamp upon its subscriber line becoming seized.
Claim 3
Dependent Claim
55 words
A supervisory lamp system for a combination telephone conference connection and call transfer device as defined in claim 1 including a normally open, manually operated electrical switch connected across said second main terminal and gate terminal elements of each of said switch means for applying associated line potential thereacross for rendering said switch means conductive.
Claim 4
Dependent Claim
86 words
a supervisory lamp system for a combination telephone conference connection and call transfer device as defined in claim 2 wherein the telephone subscriber station is of the desk set type and including a normally closed, manually operated electrical switch connected in series with one each of said circuit means for rendering said switch means nonconductive, said switches being arranged between the cradle ends of the subscriber station desk set portion so as to be inaccessible upon the handset portion being set in place on said cradle.
Claim 5
Dependent Claim
34 words
A supervisory lamp system for a combination telephone conference connection and call transfer device as defined in claim 3 wherein said normally open and normally closed manually operated switches are momentarily actuated pushbutton switches.
Claim 6
Dependent Claim
96 words
A supervisory lamp system for a combination telephone conference connection and call transfer device as defined in claim 4 wherein said circuit means comprises a full-wave rectifier connected across one of said lines, a first transistor biased by the output of said full-wave rectifier, a second transistor controlled by the output of said first transistor to normally maintain said second transistor in its cutoff state, and an output circuit including a DC load voltage for said second transistor, the associated one of said supervisory lamps being connected in series as the load in said output circuit.
Claim 7
Dependent Claim
40 words
A supervisory lamp system for a combination telephone conference connection and call transfer device as defined in claim 5 wherein said supervisory lamps and said normally open switches are mounted in the face panel of said subscriber desk set portion.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |