2939309

Information

• Patent Grant
• 2939309

• References
• Source

• Patent Number

  2,939,309

• Date Filed

  Not available

• Date Issued

  Tuesday, June 7, 1960
  64 years ago

• CPC

  • E04F11/025 - Stairways having stringers
  • E04F11/1042 - with an upper layer of fibres or chips
  • E04F11/1043 - with an upper layer of organic plastics with or without reinforcements or filling materials
  • E04F11/116 - of stone, concrete or like material or with an upper layer of stone or stone like material

• US Classifications

  • 052 - Static structures
  • D25 - Building units and construction elements