2856840

Information

• Patent Grant
• 2856840

• References
• Source

• Patent Number

  2,856,840

• Date Filed

  Not available

• Date Issued

  Tuesday, October 21, 1958
  66 years ago

• CPC

  • E06B7/04 - with ventilation wings
  • Y10S454/905 - Black out means

• US Classifications

  • 454 - Ventilation
  • 160 - Flexible or portable closure, partition, or panel