3513547

Information

• Patent Grant
• 3513547

• References
• Source

• Patent Number

  3,513,547

• Date Filed

  Not available

• Date Issued

  Tuesday, May 26, 1970
  54 years ago

• CPC

  • E04F11/032 - Spiral stairways supported by a central column
  • E04F11/108 - of wood or with an upper layer of wood
  • E04F2011/0207 - mainly of wood

• US Classifications

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