3815887

Information

• Patent Grant
• 3815887

• References
• Source

• Patent Number

  3,815,887

• Date Filed

  Not available

• Date Issued

  Tuesday, June 11, 1974
  50 years ago

• CPC

  • A47C7/34 - with springs in compression
  • A47C23/002 - with separate support elements
  • A47C27/065 - of special shape
  • F16F1/025 - characterised by having a particular shape
  • F16F1/424 - of membrane-type springs
  • F16F9/0409 - characterised by the wall structure
  • F16F2236/022 - of membrane-type springs
  • Y10S297/08 - Inflatable bellows

• US Classifications

  • 267 - Spring devices
  • 005 - Beds
  • 297 - Chairs and seats