Patent US6274963B1 successfully refreshed from Google Patents.
US3725587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for a telephone exchange system with conference equipment and having a video capability
Assignee: Siemens AG
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Filing: 1972-01-27
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Granted: 1973-04-03
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Expires: 1992-01-27
Abstract
Abstract Apparatus is described for completing a conference connection in a telephone exchange system having a video capability. Each subscriber station has a video device constituted by a camera and a television receiver which may be connected to common video lines. Upon connection of a conference signal receiver and through a temporarily operated switch a new subscriber station''s video device may be connected to the conference connection. This connection may be completed regardless of whether a conference connection already exists. Subsequently, switching means at each subscriber station, which connect the video devices therein to common video lines, are activated to switch the video devices in the subscriber stations, which were already in the conference connection, so that they can receive video signals from a subscriber station newly entering the conference connection.
Inventors
- 👤 P Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:40
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56; H04M3/567; H04Q; H04Q3/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
199 words
Apparatus for completing a conference connection in a telephone exchange system having the capability of processing video signals, comprising: a plurality of subscriber stations connected to exchange, said subscriber stations including video devices comprising television cameras and television receivers, a plurality of conference signal receiver means in said exchange which are, respectively, coupled to those of said subscriber stations forming a conference connection, common video line means connected to said video devices in those of said subscriber stations forming a conference connection, first switching means for initiating the connection of the video device in a calling subscriber station to an existing conference connection, said first switching means being temporarily activated upon the coupling of a said conference signal receiver means to said new subscriber station, said first switching means being activated regardless of the state of the conference connection and second switching means located at each said subscriber station and coupled to said first switching means as to be activated by activation of the latter, said second switching means connecting the video devices of those of said subscriber stations in the conference connection to said common video line means as to receive video transmissions from said new subscriber station.
Claim 2
Dependent Claim
199 words
Apparatus for completing a conference connection in a telephone exchange system having the capability of processing video signals, comprising: a plurality of subscriber stations connected to exchange, said subscriber stations including video devices comprising television cameras and television receivers, a plurality of conference signal receiver means in said exchange which are, respectively, coupled to those of said subscriber stations forming a conference connection, common video line means connected to said video devices in those of said subscriber stations forming a conference connection, first switching means for initiating the connection of the video device in a calling subscriber station to an existing conference connection, said first switching means being temporarily activated upon the coupling of a said conference signal receiver means to said new subscriber station, said first switching means being activated regardless of the state of the conference connection and second switching means located at each said subscriber station and coupled to said first switching means as to be activated by activation of the latter, said second switching means connecting the video devices of those of said subscriber stations in the conference connection to said common video line means as to receive video transmissions from said new subscriber station.
Claim 3
Dependent Claim
77 words
The apparatus defined in claim 1 further comprising: means for producing a video signal representation of a combination of the video signals issuing from those of said subscriber stations already in the conference connection, and combination video line means for coupling the output of said means for producing to said subscriber stations, said second switching means in said calling subscriber station, upon actuation, connecting said video device therein to receive video signals from said combination line means.
Claim 4
Dependent Claim
38 words
The apparatus defined in claim 2 further comprising: third switching means activated by activation of said first switching means for deactivating said second switching means upon the connection of the subscriber station associated therewith to said conference connection.
Claim 5
Dependent Claim
62 words
The apparatus defined in claim 1 further comprising: automatic subscriber station means for receiving dial signals from said subscriber stations and for identifying calling subscriber stations responsive to received dial signals, said station means including means for temporarily activating the first switching means of a calling subscriber station associated therewith upon identification of the dial signals corresponding to said calling subscriber station.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |