2971238

Information

• Patent Grant
• 2971238

• References
• Source

• Patent Number

  2,971,238

• Date Filed

  Not available

• Date Issued

  Tuesday, February 14, 1961
  63 years ago

• CPC

  • E04F11/022 - characterised by the supporting structure
  • B28B7/225 - for making stairs or stair units comprising more than one step

• US Classifications

  • 264 - Plastic and nonmetallic article shaping or treating: processes
  • 052 - Static structures
  • 428 - Stock material or miscellaneous articles