1438588

Information

• Patent Grant
• 1438588

• References
• Source

• Patent Number

  1,438,588

• Date Filed

  Not available

• Date Issued

  Tuesday, December 12, 1922
  102 years ago

• CPC

  • B28C1/006 - Methods

• US Classifications

  • 209 - Classifying, separating, and assorting solids
  • 175 - Boring or penetrating the earth
  • 501 - Compositions: ceramic
  • 507 - Earth boring, well treating, and oil field chemistry