Classifications

• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
  • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
  • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
  • G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
  • G01S13/767—Responders; Transponders
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
  • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
  • G01S7/56—Display arrangements
• • G—PHYSICS
  • G07—CHECKING-DEVICES
  • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
  • G07C9/00—Individual registration on entry or exit
  • G07C9/20—Individual registration on entry or exit involving the use of a pass
  • G07C9/28—Individual registration on entry or exit involving the use of a pass the pass enabling tracking or indicating presence

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Artificial Intelligence (AREA)
• Computer Vision & Pattern Recognition (AREA)
• Theoretical Computer Science (AREA)
• Radar Systems Or Details Thereof (AREA)
• Traffic Control Systems (AREA)
• Near-Field Transmission Systems (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10404881

Family Applications (1)

Country Status (9)

Families Citing this family (18)

Family Cites Families (3)

• 1975
  • 1975-09-19 GB GB38660/75A patent/GB1567750A/en not_active Expired
• 1976
  • 1976-09-10 IL IL50466A patent/IL50466A/xx unknown
  • 1976-09-14 AU AU17703/76A patent/AU505686B2/en not_active Expired
  • 1976-09-14 NL NL7610226A patent/NL7610226A/xx not_active Application Discontinuation
  • 1976-09-14 CA CA261,147A patent/CA1078047A/en not_active Expired
  • 1976-09-17 DK DK422076A patent/DK422076A/da unknown
  • 1976-09-18 JP JP51112379A patent/JPS5255890A/ja active Pending
  • 1976-09-18 DE DE19762642022 patent/DE2642022A1/de not_active Withdrawn
  • 1976-09-20 FR FR7628149A patent/FR2325251A1/fr not_active Withdrawn

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