CA1032282A - Circuit prive de systeme telephonique a boutons-poussoirs - Google Patents

Circuit prive de systeme telephonique a boutons-poussoirs

Info

Publication number
CA1032282A
CA1032282A CA232,690A CA232690A CA1032282A CA 1032282 A CA1032282 A CA 1032282A CA 232690 A CA232690 A CA 232690A CA 1032282 A CA1032282 A CA 1032282A
Authority
CA
Canada
Prior art keywords
telephone systems
key telephone
privacy circuit
privacy
circuit
Prior art date
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
CA232,690A
Other languages
English (en)
Inventor
Coy E. Matheny
Original Assignee
ITT Canada Ltd
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.)
Filing date
Publication date
Application filed by ITT Canada Ltd filed Critical ITT Canada Ltd
Application granted granted Critical
Publication of CA1032282A publication Critical patent/CA1032282A/fr
Expired legal-status Critical Current

Links

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)
CA232,690A 1974-08-08 1975-08-01 Circuit prive de systeme telephonique a boutons-poussoirs Expired CA1032282A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/495,580 US3941943A (en) 1974-08-08 1974-08-08 Privacy circuit for key telephone systems

Publications (1)

Publication Number Publication Date
CA1032282A true CA1032282A (fr) 1978-05-30

Family

ID=23969184

Family Applications (1)

Application Number Title Priority Date Filing Date
CA232,690A Expired CA1032282A (fr) 1974-08-08 1975-08-01 Circuit prive de systeme telephonique a boutons-poussoirs

Country Status (4)

Country Link
US (1) US3941943A (fr)
CA (1) CA1032282A (fr)
ES (1) ES440133A1 (fr)
GB (1) GB1505927A (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4053720A (en) * 1975-12-02 1977-10-11 International Telephone And Telegraph Corporation Automatic exclusion circuit
US4075434A (en) * 1976-03-25 1978-02-21 San/Bar Corporation Key telephone privacy exclusion apparatus
US4021621A (en) * 1976-05-07 1977-05-03 International Telephone And Telegraph Corporation Automatic group exclusion circuit for a key telephone system
US4144415A (en) * 1977-12-22 1979-03-13 International Telephone & Telegraph Corp. Key telephone system paging lockout circuit
US4158111A (en) * 1978-01-13 1979-06-12 International Telephone & Telegraph Corp. Exclusion system for a key telephone system
US4218590A (en) * 1979-01-29 1980-08-19 Crest Industries, Inc. Key telephone system having automatic exclusion circuit for line privacy
US4266103A (en) * 1979-07-26 1981-05-05 Gte Automatic Electric Laboratories Inc. Key telephone exclusion circuit
US4640988A (en) * 1984-04-03 1987-02-03 Robinton Products, Inc. Telephone interrupter
JP2888517B2 (ja) * 1987-07-10 1999-05-10 株式会社東芝 コードレス電話装置
US6980634B1 (en) * 2002-10-16 2005-12-27 James R Davis Telephone circuit controller apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3725601A (en) * 1971-03-05 1973-04-03 Bell Telephone Labor Inc Direct station selection private intercom exchange system
US3819866A (en) * 1972-12-18 1974-06-25 Bell Telephone Labor Inc Light coupled loop current detector
JPS539803B2 (fr) * 1973-01-13 1978-04-08

Also Published As

Publication number Publication date
GB1505927A (en) 1978-04-05
ES440133A1 (es) 1977-03-01
AU8359375A (en) 1977-02-03
US3941943A (en) 1976-03-02

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