3687218

Information

• Patent Grant
• 3687218

• References
• Source

• Patent Number

  3,687,218

• Date Filed

  Not available

• Date Issued

  Tuesday, August 29, 1972
  52 years ago

• CPC

  • G01V1/08 - involving time-delay devices

• US Classifications

  • 367 - Communications, electrical: acoustic wave systems and devices
  • 181 - Acoustics
  • 368 - Horology: time measuring systems or devices