Patent US3985959A successfully refreshed from Google Patents.
US3985959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Key telephone system for subscribers
Assignee: Oki Electric Industry Co Ltd
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Filing: 1975-09-30
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Granted: 1976-10-12
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Expires: 1995-09-30
Abstract
Abstract A key telephone system for subscribers is disclosed which includes at least a plurality of key telephone stations, a subscriber common equipment which connects the key telephone stations to each other and further connects the key telephone stations and an private automatic branch exchange, wherein said subscriber common equipment comprises switching network circuits, a register connecting circuit, line circuits, intra-office circuits, line circuit links, intra-office circuit links and a common controller, whereby each of said key telephone stations is connected to the subscriber common equipment through a pair of speech lines and a few control lines, and further said key telephone station can handle data processing services through said control lines by using a data terminal equipment attached to the key telephone station and a data processing unit by way of said subscriber common equipment.
Inventors
- 👤 Shigeharu Komine
- 👤 Yoshiaki Tanaka
- 👤 Shiro Kuzuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:04
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/002; H04M9/005; H04M9/007; H04M11/00; H04M11/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
260 words
A key telephone system for subscribers comprising: a key telephone station (ST) having indication lamps (for example, LP, PLP, OPBL) which indicate the status of the key telephone station, and a plurality of function buttons (for example, OPB, PB, HLD, INTR, INTO); a subscriber common equipment (CE) which is comprised of a plurality of connecting network circuits (for example, CNW 0 , CNW 1 . . . CNWn), line circuits (LC), intra-office circuits (IC) and a common controller (CC) which controls said connecting network cicuits, line circuits and intra-office circuits, where said connecting network circuits connect a speech line (SL) of one key telephone station and a speech line (SL) of the other key telephone station by using a register connecting circuit (RGC) and switching network circuits (for example, SNC 0 , SNC 1 . . . SNCn), each of which switching network circuits cooperate with both line circuit links (for example, LCL 0 , LCL 1 . . . LCLn) and intra-office circuit links (for example, ICL 0 , ICL 1 . . . ICLn), and; control lines (CL) which connect each of said key telephone stations and said subscriber common equipment, wherein a desired one of said line circuit links is caught by dialing a desired line circuit number by using push buttons means (PB) of said common controller, which desired line circuit number is indicated on said indication lamp (LP), while the desired one of said intra-office circuit links is caught by pushing a desired intra-office button (for example, INTR, INTO), by means of said common controller.
Claim 2
Dependent Claim
260 words
A key telephone system for subscribers comprising: a key telephone station (ST) having indication lamps (for example, LP, PLP, OPBL) which indicate the status of the key telephone station, and a plurality of function buttons (for example, OPB, PB, HLD, INTR, INTO); a subscriber common equipment (CE) which is comprised of a plurality of connecting network circuits (for example, CNW 0 , CNW 1 . . . CNWn), line circuits (LC), intra-office circuits (IC) and a common controller (CC) which controls said connecting network cicuits, line circuits and intra-office circuits, where said connecting network circuits connect a speech line (SL) of one key telephone station and a speech line (SL) of the other key telephone station by using a register connecting circuit (RGC) and switching network circuits (for example, SNC 0 , SNC 1 . . . SNCn), each of which switching network circuits cooperate with both line circuit links (for example, LCL 0 , LCL 1 . . . LCLn) and intra-office circuit links (for example, ICL 0 , ICL 1 . . . ICLn), and; control lines (CL) which connect each of said key telephone stations and said subscriber common equipment, wherein a desired one of said line circuit links is caught by dialing a desired line circuit number by using push buttons means (PB) of said common controller, which desired line circuit number is indicated on said indication lamp (LP), while the desired one of said intra-office circuit links is caught by pushing a desired intra-office button (for example, INTR, INTO), by means of said common controller.
Claim 3
Dependent Claim
183 words
A key telephone system for subscribers as set forth in claim 1, further including: a data terminal equipment (TAM) located on said key telephone station side; a first data separator (CAN) and a second data separator (COR) which are inserted in data control lines (CL') between said key telephone station and said common controller (CC); a third data separator (CIR) which is inserted in data control lines (CL") between said common controller and a central data processing unit (CPU); wherein data relating to said key telephone station are transmitted through said control lines (CL) during a first time-slot by way of said first, second and third data isolators, and data relating to said data terminal equipment are transmitted through both said control lines (CL) and said data control lines (CL', CL") during a second time-slot by means of said first, second and third data isolators, whereby data transmission is effected between one of said data terminal equipments and the other of said data terminal equipments and between one of said data terminal equipments and said central data processing unit during said second time-slot.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |