3221588

Information

• Patent Grant
• 3221588

• References
• Source

• Patent Number

  3,221,588

• Date Filed

  Not available

• Date Issued

  Tuesday, December 7, 1965
  59 years ago

• CPC

  • F16B25/103 - by means of a drilling screw-point
  • F16B25/0031 - the screw being designed to be screwed into different materials
  • F16B25/0084 - characterised by geometric details of the tip
  • Y10S411/96 - Friction
  • Y10T408/9045 - and different root circles
  • Y10T408/906 - Axially spaced

• US Classifications

  • 411 - Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
  • 052 - Static structures
  • 408 - Cutting by use of rotating axially moving tool
  • 470 - Threaded, headed fastener, or washer making: process and apparatus