Patent · US Expired

Antifriction fluid seal assembly

US4421330A · kind A · utility

22Cited by
4References
5Claims
0Family size

Assignee

Inventor

Key dates

Filing dateFeb 8, 1982
Grant dateDec 20, 1983
Priority date
Expiry dateFeb 8, 2002

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S277/946
  • WIPO fieldMechanical elements
  • WIPO sectorMechanical engineering

Abstract

A two-stage fluid seal assembly is provided for sealing between relatively moving parts, such as a piston and cylinder. The assembly comprises a hard-sealing, non-resilient material effective at high pressure and a resilient soft-sealing material effective at low pressures.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.