1972904

Information

• Patent Grant
• 1972904

• References
• Source

• Patent Number

  1,972,904

• Date Filed

  Not available

• Date Issued

  Tuesday, September 11, 1934
  90 years ago

• CPC

  • G03B21/34 - Change-over arrangements
  • G03B21/36 - Fades, dissolves, or wipes

• US Classifications

  • 352 - Optics: motion pictures
  • 369 - Dynamic information storage or retrieval