GB2206467B - On-line warning device - Google Patents

On-line warning device

Info

Publication number
GB2206467B
GB2206467B GB8715588A GB8715588A GB2206467B GB 2206467 B GB2206467 B GB 2206467B GB 8715588 A GB8715588 A GB 8715588A GB 8715588 A GB8715588 A GB 8715588A GB 2206467 B GB2206467 B GB 2206467B
Authority
GB
United Kingdom
Prior art keywords
warning device
line warning
line
warning
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 - Lifetime
Application number
GB8715588A
Other versions
GB2206467A (en
GB8715588D0 (en
Inventor
Glynn John Hawkins
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8715588A priority Critical patent/GB2206467B/en
Publication of GB8715588D0 publication Critical patent/GB8715588D0/en
Publication of GB2206467A publication Critical patent/GB2206467A/en
Application granted granted Critical
Publication of GB2206467B publication Critical patent/GB2206467B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
GB8715588A 1987-07-02 1987-07-02 On-line warning device Expired - Lifetime GB2206467B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8715588A GB2206467B (en) 1987-07-02 1987-07-02 On-line warning device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8715588A GB2206467B (en) 1987-07-02 1987-07-02 On-line warning device

Publications (3)

Publication Number Publication Date
GB8715588D0 GB8715588D0 (en) 1987-08-12
GB2206467A GB2206467A (en) 1989-01-05
GB2206467B true GB2206467B (en) 1991-05-01

Family

ID=10619975

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8715588A Expired - Lifetime GB2206467B (en) 1987-07-02 1987-07-02 On-line warning device

Country Status (1)

Country Link
GB (1) GB2206467B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2251156A (en) * 1990-12-18 1992-06-24 Sangara Ind Co Ltd Telephone warning light actuated by incoming call or lifting receiver
FR2672757B1 (en) * 1991-02-08 1999-02-26 France Telecom DEVICE FOR DETECTING AN UNAUTHORIZED CONNECTION ON A SUBSCRIBER TELEPHONE LINE.
GB2290673A (en) * 1994-06-20 1996-01-03 Motorola Inc Telephone status detector circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2014826A (en) * 1978-02-21 1979-08-30 Cohen E Telephone intruder alarm system
WO1985001853A1 (en) * 1983-10-20 1985-04-25 Achille Joseph Delahaye Electronic adapter for a telephone, enabling to provide a complementary call warning, different from a conventional ringing
GB2154392A (en) * 1984-02-15 1985-09-04 Peter Henderson Telephone in use indicator (line busy lamp)
GB2158677A (en) * 1984-05-07 1985-11-13 Robert J Alderman Line powered flasher circuit for providing visual indication of telephone ringing signal
GB2187362A (en) * 1986-11-19 1987-09-03 Secom Information Products Com Detecting telephone taps
GB2191911A (en) * 1986-06-19 1987-12-23 Talgold U K Telephone bell ringer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2014826A (en) * 1978-02-21 1979-08-30 Cohen E Telephone intruder alarm system
WO1985001853A1 (en) * 1983-10-20 1985-04-25 Achille Joseph Delahaye Electronic adapter for a telephone, enabling to provide a complementary call warning, different from a conventional ringing
GB2154392A (en) * 1984-02-15 1985-09-04 Peter Henderson Telephone in use indicator (line busy lamp)
GB2158677A (en) * 1984-05-07 1985-11-13 Robert J Alderman Line powered flasher circuit for providing visual indication of telephone ringing signal
GB2191911A (en) * 1986-06-19 1987-12-23 Talgold U K Telephone bell ringer
GB2187362A (en) * 1986-11-19 1987-09-03 Secom Information Products Com Detecting telephone taps

Also Published As

Publication number Publication date
GB2206467A (en) 1989-01-05
GB8715588D0 (en) 1987-08-12

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920702