GB2245800B - Telephone instrument - Google Patents

Telephone instrument

Info

Publication number
GB2245800B
GB2245800B GB9014592A GB9014592A GB2245800B GB 2245800 B GB2245800 B GB 2245800B GB 9014592 A GB9014592 A GB 9014592A GB 9014592 A GB9014592 A GB 9014592A GB 2245800 B GB2245800 B GB 2245800B
Authority
GB
United Kingdom
Prior art keywords
telephone instrument
telephone
instrument
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 - Fee Related
Application number
GB9014592A
Other versions
GB9014592D0 (en
GB2245800A (en
Inventor
Ian William Jennings
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.)
Nortel Networks Ltd
STC PLC
Alcatel Submarine Networks UK Ltd
Nortel Networks Optical Components Ltd
Original Assignee
Northern Telecom Ltd
STC PLC
Northern Telecom Europe Ltd
STC Submarine Systems Ltd
STC 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 Northern Telecom Ltd, STC PLC, Northern Telecom Europe Ltd, STC Submarine Systems Ltd, STC Ltd filed Critical Northern Telecom Ltd
Priority to GB9014592A priority Critical patent/GB2245800B/en
Publication of GB9014592D0 publication Critical patent/GB9014592D0/en
Publication of GB2245800A publication Critical patent/GB2245800A/en
Application granted granted Critical
Publication of GB2245800B publication Critical patent/GB2245800B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04M1/82—Line monitoring circuits for call progress or status discrimination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/14—Signalling existence of persistent "off-hook" condition

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
GB9014592A 1990-06-29 1990-06-29 Telephone instrument Expired - Fee Related GB2245800B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9014592A GB2245800B (en) 1990-06-29 1990-06-29 Telephone instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9014592A GB2245800B (en) 1990-06-29 1990-06-29 Telephone instrument

Publications (3)

Publication Number Publication Date
GB9014592D0 GB9014592D0 (en) 1990-08-22
GB2245800A GB2245800A (en) 1992-01-08
GB2245800B true GB2245800B (en) 1994-05-18

Family

ID=10678489

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9014592A Expired - Fee Related GB2245800B (en) 1990-06-29 1990-06-29 Telephone instrument

Country Status (1)

Country Link
GB (1) GB2245800B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19644841A1 (en) * 1996-10-29 1998-04-30 Schmiedl Tim Additional telephone unit for incorrectly replaced receiver off=hook alarm
DE19919514A1 (en) * 1999-04-29 2000-11-02 Deutsche Telekom Ag Arrangement for detecting telephone receiver off hook has mechanism for restoring receiver to state in which it can be called triggered after receiver unintentionally left off hook
DE19919512A1 (en) * 1999-04-29 2000-11-02 Deutsche Telekom Ag Telephone with function to recognize when handset is not replaced and provide acoustic alert
GB2385232B (en) * 2002-09-28 2005-01-19 Richard Herman Telephone detector
EP2309711B1 (en) 2009-10-07 2014-03-05 Deutsche Telekom AG Method and device for call clearing in telecommunication networks

Also Published As

Publication number Publication date
GB9014592D0 (en) 1990-08-22
GB2245800A (en) 1992-01-08

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20070629