3638726

Information

• Patent Grant
• 3638726

• References
• Source

• Patent Number

  3,638,726

• Date Filed

  Not available

• Date Issued

  Tuesday, February 1, 1972
  52 years ago

• CPC

  • E21B43/086 - Screens with preformed openings
  • E03B3/22 - Selection of specified materials

• US Classifications

  • 166 - Wells