3899709

Information

• Patent Grant
• 3899709

• References
• Source

• Patent Number

  3,899,709

• Date Filed

  Not available

• Date Issued

  Tuesday, August 12, 1975
  50 years ago

• CPC

  • H01J31/495 - Pick-up tubes adapted for an input of sonic, ultrasonic, or mechanical vibrations and having an electric output

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 367 - Communications, electrical: acoustic wave systems and devices