1642559

Information

• Patent Grant
• 1642559

• References
• Source

• Patent Number

  1,642,559

• Date Filed

  Not available

• Date Issued

  Tuesday, September 13, 1927
  97 years ago

• CPC

  • H02G9/08 - in tunnels
  • E21D11/15 - Plate linings Laggings
  • F16L57/00 - Protection of pipes or objects of similar shape against external or internal damage or wear

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 052 - Static structures
  • 138 - Pipes and tubular conduits