3812345

Information

• Patent Grant
• 3812345

• References
• Source

• Patent Number

  3,812,345

• Date Filed

  Not available

• Date Issued

  Tuesday, May 21, 1974
  50 years ago

• CPC

  • B61L1/025 - actuated by variation of resistance or by piezo-electricity
  • Y10S73/04 - Piezoelectric

• US Classifications

  • 246 - Railway switches and signals
  • 073 - Measuring and testing
  • 177 - Weighing scales
  • 340 - Communications: electrical
  • 367 - Communications, electrical: acoustic wave systems and devices