3557274

Information

• Patent Grant
• 3557274

• References
• Source

• Patent Number

  3,557,274

• Date Filed

  Not available

• Date Issued

  Tuesday, January 19, 1971
  53 years ago

• CPC

  • E01B9/18 - for concrete sleepers
  • B28B23/005 - with anchoring or fastening elements for the shaped articles
  • E01B3/34 - with pre-tensioned armouring or reinforcement
  • E04B1/4121 - with internal threads or non-adjustable captive nuts
  • E04G15/04 - Cores for anchor holes or the like around anchors embedded in the concrete

• US Classifications

  • 264 - Plastic and nonmetallic article shaping or treating: processes