1807822

Information

• Patent Grant
• 1807822

• References
• Source

• Patent Number

  1,807,822

• Date Filed

  Not available

• Date Issued

  Tuesday, June 2, 1931
  93 years ago

• CPC

  • G03F1/02 - by photographic processes for production of originals simulating relief
  • G03F1/00 - Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles Mask blanks or pellicles therefor Containers specially adapted therefor Preparation thereof

• US Classifications

  • 355 - Photocopying