2689988

Information

• Patent Grant
• 2689988

• References
• Source

• Patent Number

  2,689,988

• Date Filed

  Not available

• Date Issued

  Tuesday, September 28, 1954
  70 years ago

• CPC

  • E04C2/3405 - spaced apart by profiled spacer sheets
  • E04C2002/3422 - with polygonal dimples
  • E04C2002/3427 - with conical dimples
  • E04C2002/3438 - with saddle-shaped dimples
  • Y10T428/24661 - Forming, or cooperating to form cells

• US Classifications

  • 052 - Static structures
  • 181 - Acoustics
  • 428 - Stock material or miscellaneous articles