3857632

Information

• Patent Grant
• 3857632

• References
• Source

• Patent Number

  3,857,632

• Date Filed

  Not available

• Date Issued

  Tuesday, December 31, 1974
  50 years ago

• CPC

  • G02B23/08 - Periscopes
  • B60R1/084 - using a removable filtering or hiding screen
  • B60R1/10 - Front-view mirror arrangements; periscope arrangements
  • F41H5/266 - Periscopes for fighting or armoured vehicles

• US Classifications

  • 359 - Optical: systems and elements