1997389

Information

• Patent Grant
• 1997389

• References
• Source

• Patent Number

  1,997,389

• Date Filed

  Not available

• Date Issued

  Tuesday, April 9, 1935
  89 years ago

• CPC

  • B31F1/32 - Corrugating already corrugated webs
  • B29C53/285 - using rolls or endless bands
  • E04B1/78 - Heat insulating elements
  • Y10S428/92 - Fire or heat protection feature
  • Y10T428/24562 - Interlaminar spaces
  • Y10T428/2457 - Parallel ribs and/or grooves
  • Y10T428/24661 - Forming, or cooperating to form cells
  • Y10T428/24694 - Parallel corrugations

• US Classifications

  • 428 - Stock material or miscellaneous articles
  • 156 - Adhesive bonding and miscellaneous chemical manufacture