Classifications

• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03F—AMPLIFIERS
  • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
  • H03F1/52—Circuit arrangements for protecting such amplifiers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B61—RAILWAYS
  • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
  • B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
  • B61L23/08—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only
  • B61L23/14—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only automatically operated
  • B61L23/16—Track circuits specially adapted for section blocking
  • B61L23/168—Track circuits specially adapted for section blocking using coded current

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Mechanical Engineering (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)
• Train Traffic Observation, Control, And Security (AREA)
• Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
• Amplifiers (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24653691

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Family Cites Families (2)

• 1976
  • 1976-02-26 US US05/661,460 patent/US4042888A/en not_active Expired - Lifetime
• 1977
  • 1977-02-23 CA CA272,501A patent/CA1087696A/en not_active Expired
  • 1977-02-24 BR BR7701123A patent/BR7701123A/pt unknown
  • 1977-02-25 IT IT20707/77A patent/IT1104779B/it active
  • 1977-02-25 JP JP52019396A patent/JPS5819163B2/ja not_active Expired

Also Published As

Similar Documents