3668368

Information

• Patent Grant
• 3668368

• References
• Source

• Patent Number

  3,668,368

• Date Filed

  Not available

• Date Issued

  Tuesday, June 6, 1972
  52 years ago

• CPC

  • H05B3/00 - Ohmic-resistance heating
  • E01C11/265 - Embedded electrical heating elements ; Mounting thereof
  • E21D11/003 - Linings or provisions thereon, specially adapted for traffic tunnels
  • H05B2214/02 - Heaters specially designed for de-icing or protection against icing

• US Classifications

  • 219 - Electric heating
  • 405 - Hydraulic and earth engineering