中科微点-全球专利检索

  1. Login
  2. Sign Up
Invention Grant
US2491654A Exposure meter having object and comparison gray scale means 失效
具有对象和比较灰度等级的曝光表

  • Patent Title: Exposure meter having object and comparison gray scale means
  • Patent Title (中): 具有对象和比较灰度等级的曝光表
  • Application No.: US69514146
    Application Date: 1946-09-06
  • Publication No.: US2491654A
    Publication Date: 1949-12-20
  • Inventor: FOUST JOHN L
  • Applicant: FOUST JOHN L
  • Assignee: John L Foust
  • Current Assignee: John L Foust
  • Priority: US69514146 1946-09-06
  • Main IPC: G01J1/12
  • IPC: G01J1/12
Exposure meter having object and comparison gray scale means
Information query
Espacenet
Patent Agency Ranking
0/0