3476561

Information

• Patent Grant
• 3476561

• References
• Source

• Patent Number

  3,476,561

• Date Filed

  Not available

• Date Issued

  Tuesday, November 4, 1969
  55 years ago

• CPC

  • G11C11/06085 - Multi-aperture structures or multi-magnetic closed circuits, each aperture storing a "bit", realised by rods, plates, grids, waffle-irons,(
  • C23F1/02 - Local etching
  • G03F7/095 - having more than one photosensitive layer
  • G03F7/2022 - Multi-step exposure
  • H05K3/064 - Photoresists
  • H05K2203/0505 - Double exposure of the same photosensitive layer
  • H05K2203/0577 - Double layer of resist having the same pattern

• US Classifications

  • 430 - Radiation imagery chemistry: process, composition, or product thereof
  • 216 - Etching a substrate: processes