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PCE
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CPC Subgroup
G01N 9/12

by observing the depth of immersion of the bodies, e.g. hydrometers

Full Title

Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity > by observing bodies wholly or partially immersed in fluid materials > by observing the depth of immersion of the bodies, e.g. hydrometers

3 direct subcodes

Child Classifications

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  • G01N 9/14 the body being built into a container
  • G01N 9/16 the body being pivoted
  • G01N 9/18 Special adaptations for indicating, recording, or control

Top Applicants

Top 10 applicants by patent filingsfor class G01, 2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 21,460
  2. ROBERT BOSCH DE 17,801
  3. SGCC(STATE GRID CORPORATION OF CHINA) 17,347
  4. SAMSUNG ELECTRONICS COMPANY KR 13,192
  5. QUALCOMM US 9,900
  6. HALLIBURTON ENERGY SERVICES GROUP US 9,742
  7. PHILIPS ELECTRONICS NL 7,249
  8. MITSUBISHI ELECTRIC CORPORATION JP 6,503
  9. ZHEJIANG UNIVERSITY 6,414
  10. DENSO CORPORATION JP 6,382