3221584

Information

• Patent Grant
• 3221584

• References
• Source

• Patent Number

  3,221,584

• Date Filed

  Not available

• Date Issued

  Tuesday, December 7, 1965
  59 years ago

• CPC

  • B31B1/24 - Making window openings
  • B31B2201/908 - involving cutting window openings
  • Y10S83/911 - Envelope blank forming
  • Y10T83/283 - With means to control or modify temperature of apparatus or work

• US Classifications

  • 083 - Cutting
  • 219 - Electric heating
  • 392 - Electric resistance heating devices