3890747

Information

• Patent Grant
• 3890747

• References
• Source

• Patent Number

  3,890,747

• Date Filed

  Not available

• Date Issued

  Tuesday, June 24, 1975
  49 years ago

• CPC

  • E04B7/24 - the slabs being collapsible or retractable
  • E04B1/3442 - folding out from a core cell
  • E04B7/02 - with plane sloping surfaces
  • E04F17/02 - for carrying away waste gases
  • E06B9/17 - Parts or details of roller shutters
  • E06B9/1703 - Fixing of the box; External plastering of the box

• US Classifications

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