CA1111583A - Systeme telephonique a cles - Google Patents

Systeme telephonique a cles

Info

Publication number: CA1111583A
Authority: CA; Canada
Prior art keywords: line; telephone; circuit; hold; hook
Prior art date: 1977-08-01
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired

Application number

CA308,491A

Other languages

English (en)

Inventor

Harry R. Rasmussen

Robert D. Hailey

Gene A. Kimzey

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Crest Industries Inc

Original Assignee

Crest Industries Inc

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1977-08-01

Filing date

1978-07-31

Publication date

1981-10-27

1977-08-01 Priority claimed from US05/820,785 external-priority patent/US4132860A/en

1977-10-17 Priority claimed from US05/842,569 external-priority patent/US4133985A/en

1978-07-31 Application filed by Crest Industries Inc filed Critical Crest Industries Inc

1981-10-27 Application granted granted Critical

1981-10-27 Publication of CA1111583A publication Critical patent/CA1111583A/fr

Status Expired legal-status Critical Current

Links

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Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)
Sub-Exchange Stations And Push- Button Telephones (AREA)

CA308,491A 1977-08-01 1978-07-31 Systeme telephonique a cles Expired CA1111583A (fr)

Applications Claiming Priority (4)

Application Number	Priority Date	Filing Date	Title
US05/820,785 US4132860A (en)	1977-08-01	1977-08-01	Hold control for a key telephone system
US820,785		1977-08-01
US05/842,569 US4133985A (en)	1977-10-17	1977-10-17	Key telephone system
US842,569		1992-02-27

Publications (1)

Publication Number	Publication Date
CA1111583A true CA1111583A (fr)	1981-10-27

Family

ID=27124480

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA308,491A Expired CA1111583A (fr)	1977-08-01	1978-07-31	Systeme telephonique a cles

Country Status (2)

Country	Link
CA (1)	CA1111583A (fr)
WO (1)	WO1979000078A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3246082A (en) *	1962-03-26	1966-04-12	Levy Alfred	Telephone hold program system
US3870831A (en) *	1973-06-27	1975-03-11	William I Mccarley	Telephone hold circuit
US3916116A (en) *	1973-12-12	1975-10-28	Bell Telephone Labor Inc	Hold bridge circuit
US3906168A (en) *	1973-12-12	1975-09-16	Bell Telephone Labor Inc	Visual status indicator circuit
US3909554A (en) *	1974-08-23	1975-09-30	Lordel Manufacturing Company	Control circuit for key telephone system
US4011413A (en) *	1976-01-12	1977-03-08	Gimix, Inc.	Hold circuit for telephone
CA1049672A (fr) *	1976-11-18	1979-02-27	Jeffrey Pappas	Circuit de ligne pour systeme telephonique a clavier
US4090038A (en) *	1977-07-14	1978-05-16	Bell Telephone Laboratories, Incorporated	Audio signal on hold circuit

1978
- 1978-07-28 WO PCT/US1978/000056 patent/WO1979000078A1/fr not_active Ceased
- 1978-07-31 CA CA308,491A patent/CA1111583A/fr not_active Expired

Also Published As

Publication number	Publication date
WO1979000078A1 (fr)	1979-02-22

Similar Documents

Publication	Publication Date	Title
US4132860A (en)	1979-01-02	Hold control for a key telephone system
US4769837A (en)	1988-09-06	Device for adding intercom functions to a phone system
US5040209A (en)	1991-08-13	Telephone ringing monitoring and control system
US3436488A (en)	1969-04-01	Line circuit for a key telephone system utilizing a single multifunction supervisory relay
US5086458A (en)	1992-02-04	Telephone answering system and apparatus for direct caller selection of a party line extension
US4490583A (en)	1984-12-25	Plural line telephone controller
US5333190A (en)	1994-07-26	Telephone ring detection method and apparatus
US4133985A (en)	1979-01-09	Key telephone system
US3406262A (en)	1968-10-15	Signaling arrangements controlled by line ringing current
US4027109A (en)	1977-05-31	Telephone call diverting system
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US4096358A (en)	1978-06-20	Key telephone system signal priority arrangement
US4408102A (en)	1983-10-04	Two-wire exchange telephone system
US3420963A (en)	1969-01-07	Communication system line circuit particularly for key telephone systems
US3865995A (en)	1975-02-11	Universal subscriber{3 s line circuit in a key telephone system
CA1111583A (fr)	1981-10-27	Systeme telephonique a cles
US4081624A (en)	1978-03-28	Key telephone intercom line system
US3647983A (en)	1972-03-07	Key system line card circuit
EP0112728B1 (fr)	1987-01-07	Système téléphonique d'abonné
US5497415A (en)	1996-03-05	Automatic release device for automatically releasing the hold-on setting of an outside line call, and transfer method for an outside line call
US3965306A (en)	1976-06-22	Telephone line transfer circuit
US5392341A (en)	1995-02-21	Automatic telephone line monitoring and selection apparatus and method
US3909554A (en)	1975-09-30	Control circuit for key telephone system
US3730999A (en)	1973-05-01	Telephone ring-trip circuit
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Legal Events

Date	Code	Title	Description
1998-10-27	MKEX	Expiry