1689823

Information

• Patent Grant
• 1689823

• References
• Source

• Patent Number

  1,689,823

• Date Filed

  Not available

• Date Issued

  Tuesday, October 30, 1928
  96 years ago

• CPC

  • E06B3/163 - with a filled cavity
  • E06B3/16 - Hollow frames of special construction
  • E06B3/988 - specially adapted for sheet metal frame members with an open U-shaped cross-section

• US Classifications

  • 052 - Static structures