2540640

Information

• Patent Grant
• 2540640

• References
• Source

• Patent Number

  2,540,640

• Date Filed

  Not available

• Date Issued

  Tuesday, February 6, 1951
  74 years ago

• CPC

  • H03F3/22 - with tubes only
  • H03J3/00 - Continuous tuning
  • H03J3/12 - Electrically-operated arrangements for indicating correct tuning

• US Classifications

  • 334 - Tuners
  • 318 - Electricity: motive power systems
  • 330 - Amplifiers