NL7305814A - - Google Patents

Info

Publication number
NL7305814A
NL7305814A NL7305814A NL7305814A NL7305814A NL 7305814 A NL7305814 A NL 7305814A NL 7305814 A NL7305814 A NL 7305814A NL 7305814 A NL7305814 A NL 7305814A NL 7305814 A NL7305814 A NL 7305814A
Authority
NL
Netherlands
Application number
NL7305814A
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 filed Critical
Publication of NL7305814A publication Critical patent/NL7305814A/xx

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
NL7305814A 1972-04-27 1973-04-26 NL7305814A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00248337A US3805064A (en) 1972-04-27 1972-04-27 Radiation sensitive intrusion detection system

Publications (1)

Publication Number Publication Date
NL7305814A true NL7305814A (de) 1973-10-30

Family

ID=22938677

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7305814A NL7305814A (de) 1972-04-27 1973-04-26

Country Status (13)

Country Link
US (1) US3805064A (de)
JP (1) JPS4948298A (de)
AU (1) AU475279B2 (de)
BE (1) BE798412A (de)
CA (1) CA1008942A (de)
DE (1) DE2320070A1 (de)
ES (1) ES414140A1 (de)
FR (1) FR2182574A5 (de)
GB (1) GB1413414A (de)
IT (1) IT980335B (de)
NL (1) NL7305814A (de)
SE (1) SE385055B (de)
ZA (1) ZA731749B (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2818942C2 (de) * 1978-04-28 1986-03-27 Zellweger Uster Ag, Uster Verfahren zur Raumüberwachung und Vorrichtung zur Durchführung des Verfahrens
US4239961A (en) * 1979-01-23 1980-12-16 Theodore Lasar Photoelectric light curtain using retroreflector
US4294543A (en) * 1979-11-13 1981-10-13 Command Control & Communications Corporation Optical system for developing point coordinate information
US4794248A (en) * 1985-07-16 1988-12-27 Otis Elevator Company Detection device having energy transmitters located at vertically spaced apart points along movable doors
USRE33668E (en) * 1981-02-10 1991-08-20 Otis Elevator Company Detection device having energy transmitters located at vertically spaced apart points along movable doors
DE3152800A1 (de) * 1981-07-16 1983-08-25 Fa. Aug. Winkhaus, 4404 Telgte Alarmmelder zur sicherung eines durchgangs oder durchgangsabschnitts
DE3128073C2 (de) * 1981-07-16 1984-01-26 Fa. Aug. Winkhaus, 4404 Telgte Alarmmelder zur Sicherung eines Durchgangs oder eines Durchgangsabschnitts
US4893005A (en) * 1986-04-11 1990-01-09 Development/Consulting Associates Method and apparatus for area and perimeter security with reflection counting
US5567931A (en) * 1994-10-25 1996-10-22 Otis Elevator Company Variable beam detection using a dynamic detection threshold
CA2158902A1 (en) * 1994-10-25 1996-04-26 Brian J. Amend Weak beam detection
US7295831B2 (en) * 2003-08-12 2007-11-13 3E Technologies International, Inc. Method and system for wireless intrusion detection prevention and security management

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419459A (en) * 1944-02-01 1947-04-22 Gen Electric Photoelectric detecting apparatus
US2769374A (en) * 1951-10-19 1956-11-06 Sick Erwin Electrical light screen
US3235738A (en) * 1962-05-14 1966-02-15 Sensi Tronics Inc Photoelectric apparatus for detecting objects in an area
US3335285A (en) * 1964-03-24 1967-08-08 Jr John Gally Photoelectric system for detecting objects in a zone including vibrating light source
US3336585A (en) * 1965-04-05 1967-08-15 Stanford Research Inst Electronic motion detector
US3545572A (en) * 1967-08-18 1970-12-08 Montgomery Elevator Co Elevator door control

Also Published As

Publication number Publication date
AU475279B2 (en) 1976-08-19
DE2320070A1 (de) 1973-11-08
CA1008942A (en) 1977-04-19
BE798412A (fr) 1973-08-16
ES414140A1 (es) 1976-02-01
GB1413414A (en) 1975-11-12
JPS4948298A (de) 1974-05-10
AU5427573A (en) 1974-10-10
ZA731749B (en) 1973-12-19
FR2182574A5 (de) 1973-12-07
SE385055B (sv) 1976-05-31
IT980335B (it) 1974-09-30
US3805064A (en) 1974-04-16

Similar Documents

Publication Publication Date Title
BG17425A1 (de)
BG18040A1 (de)
BG18093A1 (de)
BG18259A2 (de)
BG18348A1 (de)
BG20556A3 (de)
BG20869A1 (de)
BG27060A3 (de)
CH1504872A4 (de)
CH4872A4 (de)
CH545575A (de)
CH545622A (de)
CH545877A (de)
CH559805B5 (de)
CH560132A5 (de)
CH560280A (de)
CH560979A5 (de)
CH562125A5 (de)
CH565056A5 (de)
CH566222A5 (de)
CH566648A5 (de)
CH567892A5 (de)
CH569645A5 (de)
CH569670A5 (de)
CH569819A5 (de)