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IPC Subgroup
F16F 9/08

in a chamber with a flexible wall

Introduced: September 1968

Last revised: January 2006

Full Title

Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium > using both gas and liquid > in a chamber with a flexible wall

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
Subclass:
SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

Filing statistics

IPC F16F 9/08 belongs to the parent subclass F16F, which recorded 296,948 patent applications worldwide between 2013 and 2023. Annual filings grew from 9,457 in 2013 to 37,886 in 2023 (+301%), peaking at 56,012 applications in 2020. The most active applicants in class F16 are SCHAEFFLER TECHNOLOGIES & COMPANY (21,545 applications), ZAHNRADFABRIK FRIEDRICHSHAFEN (9,446 applications) and TOYOTA MOTOR CORPORATION (7,215 applications).

Source: EPO PATSTAT, worldwide filings

4 direct subcodes

Child Classifications

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  • F16F 9/084 comprising a gas spring contained within a flexible wall, the wall not being in contact with the damping fluid, i.e. mounted externally on the damper cylinder
  • F16F 9/088 comprising a gas spring with a flexible wall provided within the cylinder on the piston rod of a monotubular damper or within the inner tube of a bitubular damper
  • F16F 9/092 comprising a gas spring with a flexible wall provided between the tubes of a bitubular damper
  • F16F 9/096 comprising a hydropneumatic accumulator of the membrane type provided on the upper or the lower end of a damper or separately from or laterally on the damper

Top Applicants

Top 10 applicants by patent filingsfor class F16, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SCHAEFFLER TECHNOLOGIES & COMPANY DE 21,545
  2. ZAHNRADFABRIK FRIEDRICHSHAFEN DE 9,446
  3. TOYOTA MOTOR CORPORATION 7,215
  4. HYUNDAI MOTOR COMPANY KR 6,846
  5. ROBERT BOSCH DE 6,106
  6. NTN CORPORATION 5,305
  7. SKF SE 4,219
  8. KIA MOTORS CORPORATION KR 3,852
  9. NSK 3,850
  10. HONDA MOTOR COMPANY 3,639