3805312

Information

• Patent Grant
• 3805312

• References
• Source

• Patent Number

  3,805,312

• Date Filed

  Not available

• Date Issued

  Tuesday, April 23, 1974
  50 years ago

• CPC

  • B43L21/02 - with means for absorbing the chalk dust
  • A47L13/50 - Auxiliary implements
  • Y10S248/91 - Weighted base

• US Classifications

  • 015 - Brushing, scrubbing, and general cleaning
  • 248 - Supports