2203656

Information

• Patent Grant
• 2203656

• References
• Source

• Patent Number

  2,203,656

• Date Filed

  Not available

• Date Issued

  Tuesday, June 4, 1940
  85 years ago

• CPC

  • G03F3/06 - by masking

• US Classifications

  • 430 - Radiation imagery chemistry: process, composition, or product thereof