Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Subgroup
G01L 21/16

by measuring variation of frictional resistance of gases

Introduced: September 1968

Full Title

Vacuum gauges > by measuring variation of frictional resistance of gases

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

Child Classifications

Navigate with arrow keys, Enter to open

  • G01L 21/18 using a pendulum IPC+CPC Available in IPC and CPC
  • G01L 21/20 using members oscillating about a vertical axis IPC+CPC Available in IPC and CPC
  • G01L 21/22 using resonance effects of a vibrating body; Vacuum gauges of the Klumb type IPC+CPC Available in IPC and CPC
  • G01L 21/24 using rotating members; Vacuum gauges of the Langmuir type IPC+CPC Available in IPC and CPC