2229920

Information

• Patent Grant
• 2229920

• References
• Source

• Patent Number

  2,229,920

• Date Filed

  Not available

• Date Issued

  Tuesday, January 28, 1941
  84 years ago

• CPC

  • D06M15/155 - Treatment in the presence of salts derived from amphoteric metal hydroxides
  • D06M11/38 - Oxides or hydroxides of elements of the first Group of the Periodic System
  • D06M11/45 - Oxides or hydroxides of elements of the third Group of the Periodic System Aluminates
  • D06M11/82 - with boron oxides with boric, meta- or perboric acids or their salts
  • D06P1/46 - using compositions containing natural macromolecular substances or derivatives thereof
  • D06P1/67341 - of elements different from the alkaline or alkaline-earth metals or with anions containing those elements
  • H03J5/32 - Stationary tuning circuits or elements selected by push-button

• US Classifications

  • 455 - Telecommunications
  • 200 - Electricity: circuit makers and breakers
  • 312 - Supports: cabinet structure
  • 334 - Tuners