JOHN CRANE INC.
65Patents
20Active
65Granted
51Portfolio score
Filing activity: Jul 21, 1988 → Jun 15, 2023 · 5 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| 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.