GB2014826B - Telephone intruder alarm system - Google Patents
Telephone intruder alarm systemInfo
- Publication number
- GB2014826B GB2014826B GB7905924A GB7905924A GB2014826B GB 2014826 B GB2014826 B GB 2014826B GB 7905924 A GB7905924 A GB 7905924A GB 7905924 A GB7905924 A GB 7905924A GB 2014826 B GB2014826 B GB 2014826B
- Authority
- GB
- United Kingdom
- Prior art keywords
- telephone
- alarm system
- intruder alarm
- intruder
- telephone intruder
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Alarm Systems (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/879,476 US4136266A (en) | 1978-02-21 | 1978-02-21 | Telephone intruder alert system |
US05/964,947 US4230914A (en) | 1978-11-30 | 1978-11-30 | System for and method of indicating intruder presence on telephone lines, and method of installation of telephone intruder alarm system |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2014826A GB2014826A (en) | 1979-08-30 |
GB2014826B true GB2014826B (en) | 1982-03-31 |
Family
ID=27128539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7905924A Expired GB2014826B (en) | 1978-02-21 | 1979-02-20 | Telephone intruder alarm system |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2014826B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2154392A (en) * | 1984-02-15 | 1985-09-04 | Peter Henderson | Telephone in use indicator (line busy lamp) |
US4726048A (en) * | 1984-04-03 | 1988-02-16 | Waldman Herbert H | Telephone privacy circuit |
GB2206467B (en) * | 1987-07-02 | 1991-05-01 | Glynn John Hawkins | On-line warning device |
SG44843A1 (en) * | 1992-10-14 | 1997-12-19 | Philips Electronics Nv | Device for detecting the activation of a parallel connected telephone set |
-
1979
- 1979-02-20 GB GB7905924A patent/GB2014826B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2014826A (en) | 1979-08-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |