3909992

Information

• Patent Grant
• 3909992

• References
• Source

• Patent Number

  3,909,992

• Date Filed

  Not available

• Date Issued

  Tuesday, October 7, 1975
  49 years ago

• CPC

  • E04B1/3211 - Structures with a vertical rotation axis or the like
  • E04B1/169 - inflatable
  • E04H15/20 - inflatable
  • E04B2001/3217 - Auxilliary supporting devices used during erection of the arched structures
  • E04B2001/3264 - hardened in-situ
  • E04H2015/206 - Details of inflation devices
  • E04H2015/207 - Tents specially designed for insulation

• US Classifications

  • 052 - Static structures
  • 135 - Tent, canopy, umbrella, or cane