Patent assignee · US · COMPANY

JOHN CRANE INC.

65Patents
20Active
65Granted
51Portfolio score

Filing activity: Jul 21, 1988 → Jun 15, 2023 · 5 expiring within 5 years

Most-cited patents

PatentTitleAreaCited byStatus
US5201531A Face seal with double spiral grooves Mechanical Engineering; Lighting; Heating 65 Expired
US5529315A Tandem seal arrangement for mechanical face seals Emerging Cross-Sectional Technologies 60 Expired
US5947479A Mechanical seal with flexible metal diaphragm Mechanical Engineering; Lighting; Heating 59 Expired
US6142478A Gas lubricated slow speed seal Mechanical Engineering; Lighting; Heating 53 Expired
US5249812A Barrier seal systems Mechanical Engineering; Lighting; Heating 49 Expired
US5492341A Non-contacting, gap-type seal having a ring with a patterned seal face Mechanical Engineering; Lighting; Heating 47 Expired
US5441283A Non-contacting mechanical face seal Mechanical Engineering; Lighting; Heating 46 Expired
US5071141A Spiral groove seal arrangement for high vapor-pressure liquids Mechanical Engineering; Lighting; Heating 44 Expired
US5713576A Gas lubricated barrier seal Emerging Cross-Sectional Technologies 43 Expired
US7377518B2 Mechanical seal ring assembly with hydrodynamic pumping mechanism Mechanical Engineering; Lighting; Heating 43 Expired
US5375853A Secondary containment seal Emerging Cross-Sectional Technologies 35 Expired
US5172918A Secondary seal for gas turbines Mechanical Engineering; Lighting; Heating 34 Expired
US5490679A Seal ring design Mechanical Engineering; Lighting; Heating 34 Expired
US5090712A Non-contacting, gap-type seal having a ring with a patterned microdam seal face Mechanical Engineering; Lighting; Heating 34 Expired
US5199720A Split mechanical face seal Mechanical Engineering; Lighting; Heating 33 Expired
US5957461A Radial lip shaft seal Mechanical Engineering; Lighting; Heating 32 Expired
US5114163A Split mechanical face seal Mechanical Engineering; Lighting; Heating 31 Expired
US5217233A Spiral groove seal system for sealing a high pressure gas Emerging Cross-Sectional Technologies 30 Expired
US5454572A Mechanical end face seal system Mechanical Engineering; Lighting; Heating 29 Expired
US6655693B2 Non-contacting gas compressor seal Mechanical Engineering; Lighting; Heating 28 Expired
US6626436B2 Monitoring seal system Mechanical Engineering; Lighting; Heating 27 Expired
US5605339A Non-contacting mechanical face seal Mechanical Engineering; Lighting; Heating 26 Expired
US4884945A Dynamic seal arrangement for impeller pump Mechanical Engineering; Lighting; Heating 25 Expired
US5975538A Radial lip shaft seal Mechanical Engineering; Lighting; Heating 25 Expired
US5938206A Pressure responsive primary ring for a non-contacting mechanical end face seal Mechanical Engineering; Lighting; Heating 25 Expired

Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.