2140639

Information

• Patent Grant
• 2140639

• References
• Source

• Patent Number

  2,140,639

• Date Filed

  Not available

• Date Issued

  Tuesday, December 20, 1938
  86 years ago

• CPC

  • G06M3/022 - by subtracting
  • C08B3/06 - Cellulose acetate

• US Classifications

  • 536 - Organic compounds
  • 156 - Adhesive bonding and miscellaneous chemical manufacture