FR2021981B1 - - Google Patents

Info

Publication number
FR2021981B1
FR2021981B1 FR6935328A FR6935328A FR2021981B1 FR 2021981 B1 FR2021981 B1 FR 2021981B1 FR 6935328 A FR6935328 A FR 6935328A FR 6935328 A FR6935328 A FR 6935328A FR 2021981 B1 FR2021981 B1 FR 2021981B1
Authority
FR
France
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
FR6935328A
Other languages
French (fr)
Other versions
FR2021981A1 (en
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.)
American District Telegraph Co
Original Assignee
American District Telegraph Co
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 American District Telegraph Co filed Critical American District Telegraph Co
Publication of FR2021981A1 publication Critical patent/FR2021981A1/fr
Application granted granted Critical
Publication of FR2021981B1 publication Critical patent/FR2021981B1/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/181—Prevention or correction of operating errors due to failing power supply
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
FR6935328A 1968-10-31 1969-10-15 Expired FR2021981B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77225968A 1968-10-31 1968-10-31

Publications (2)

Publication Number Publication Date
FR2021981A1 FR2021981A1 (en) 1970-07-24
FR2021981B1 true FR2021981B1 (en) 1973-04-06

Family

ID=25094469

Family Applications (1)

Application Number Title Priority Date Filing Date
FR6935328A Expired FR2021981B1 (en) 1968-10-31 1969-10-15

Country Status (7)

Country Link
US (1) US3618069A (en)
BE (1) BE740214A (en)
CA (1) CA918776A (en)
DE (1) DE1952229C3 (en)
FR (1) FR2021981B1 (en)
GB (1) GB1257729A (en)
NL (1) NL158952B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855480A (en) * 1971-05-21 1974-12-17 Merestechnikai Kozponti Fault-indicating circuit for a flow-metering system
US3811126A (en) * 1972-06-07 1974-05-14 Smelting Refining And Mining C Alarm system
US3792470A (en) * 1972-07-17 1974-02-12 Johnson Service Co Coded tone multiplexed alarm transmission system
US4144528A (en) * 1976-12-29 1979-03-13 Compalarm Systems Co. Alarm system
US4253091A (en) * 1977-01-05 1981-02-24 Mobil Oil Corporation Method and apparatus for detection of alarm conditions
CN106823226A (en) * 2017-02-20 2017-06-13 广州市景彤机电设备有限公司 A kind of intelligent fire-pretection system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441502A (en) * 1940-08-01 1948-05-11 American District Telegraph Co Unit transmitter and signaling system
US2938197A (en) * 1954-09-14 1960-05-24 Automatic Fire Alarm Company Automatic alarm transmitter
US2996652A (en) * 1956-11-21 1961-08-15 Automatic Fire Alarm Company Battery charging and supervisory apparatus for closed circuit alarm systems
US3002105A (en) * 1959-08-20 1961-09-26 Charles A Cady Emergency power supply
US3085235A (en) * 1959-11-18 1963-04-09 Morse Signal Devices Inc Power supply for burglar or fire alarm
US3060416A (en) * 1960-03-18 1962-10-23 Honeywell Regulator Co Supervised signal system
US3176283A (en) * 1962-02-15 1965-03-30 Honeywell Inc Supervised annunciator
US3267450A (en) * 1964-01-06 1966-08-16 Honeywell Inc Alarm apparatus
US3267288A (en) * 1964-10-20 1966-08-16 Newmark Products Inc System for floating a battery on a load line
US3500377A (en) * 1966-10-21 1970-03-10 American District Telegraph Co Noninterfering electrical signaling system
US3505531A (en) * 1966-11-15 1970-04-07 Bendix Corp Control circuit for electrical systems having redundant power supplies

Also Published As

Publication number Publication date
BE740214A (en) 1970-04-13
DE1952229C3 (en) 1975-04-10
US3618069A (en) 1971-11-02
NL158952B (en) 1978-12-15
DE1952229A1 (en) 1970-05-06
DE1952229B2 (en) 1974-08-29
NL6915785A (en) 1970-05-04
GB1257729A (en) 1971-12-22
FR2021981A1 (en) 1970-07-24
CA918776A (en) 1973-01-09

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Legal Events

Date Code Title Description
ST Notification of lapse