3578913

Information

• Patent Grant
• 3578913

• References
• Source

• Patent Number

  3,578,913

• Date Filed

  Not available

• Date Issued

  Tuesday, May 18, 1971
  53 years ago

• CPC

  • H04R25/00 - Deaf-aid sets providing an auditory perception; Electric tinnitus maskers providing an auditory perception
  • H03F1/34 - Negative-feedback-circuit arrangements with or without positive feedback
  • H03G3/10 - having semiconductor devices
  • H03G3/12 - incorporating negative feedback
  • H03G3/3005 - in amplifiers suitable for low-frequencies

• US Classifications

  • 381 - Electrical audio signal processing systems and devices