1813993

Information

• Patent Grant
• 1813993

• References
• Source

• Patent Number

  1,813,993

• Date Filed

  Not available

• Date Issued

  Tuesday, July 14, 1931
  94 years ago

• CPC

  • B21F35/00 - Making springs from wire
  • B21F33/04 - Connecting ends of helical springs for mattresses
  • B68G9/00 - Placing upholstery springs in pockets Fitting springs in upholstery
  • B68G2009/005 - Devices for turning the springs 90° inside the pockets

• US Classifications

  • 053 - Package making
  • 112 - Sewing