NIPPON PILLAR PACKING CO., LTD.
275Patents
133Active
275Granted
51Portfolio score
Filing activity: Jun 7, 1976 → Oct 17, 2024 · 22 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5311899A | Coupling device | Emerging Cross-Sectional Technologies | 74 | Expired |
| US5992857A | Composite gasket | Emerging Cross-Sectional Technologies | 52 | Expired |
| US6564828B1 | Check valve | Emerging Cross-Sectional Technologies | 50 | Expired |
| US5240769A | Packing material and packing made of the same | Emerging Cross-Sectional Technologies | 48 | Expired |
| US5134030A | Packing material and packing made of the same | Emerging Cross-Sectional Technologies | 48 | Expired |
| US5242871A | Heat-resistant expansion member | Emerging Cross-Sectional Technologies | 46 | Expired |
| US5501470A | Non-contacting shaft sealing device with grooved face pattern | Mechanical Engineering; Lighting; Heating | 44 | Expired |
| US6135458A | Static pressure non-contact gas seal | Mechanical Engineering; Lighting; Heating | 44 | Expired |
| US5664787A | Non-contacting shaft sealing device | Mechanical Engineering; Lighting; Heating | 42 | Expired |
| US4455334A | Molded gland packing | Emerging Cross-Sectional Technologies | 41 | Expired |
| US6089965A | Polishing pad | Performing Operations; Transporting | 39 | Expired |
| USD464409S1 | Sleeve for tube fitting | General | 39 | Expired |
| US6357753B1 | Cartridge-type mechanical seal | Mechanical Engineering; Lighting; Heating | 39 | Expired |
| US5765838A | Sealing gasket made of expanded graphite, with opened thin-leaf surface structure | Mechanical Engineering; Lighting; Heating | 38 | Expired |
| USD461545S1 | Sleeve for tube fitting | General | 35 | Expired |
| US6135054A | Semiconductor wafer holder with CVD silicon carbide film coating | Electricity | 34 | Expired |
| US5522603A | Packing rings, method for production of the packing rings, and seal device using the packing rings | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5421593A | Shaft seal device | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5743572A | Pipe joint made of resin | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US5154453A | Pipe joint made of resin | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US6045164A | Pipe joint made of resin | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US6382633B1 | Shaft seal device using gland packing | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US7374409B2 | Reciprocating pump | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US6864008B2 | Separator for a fuel cell and manufacturing method of the separator | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4705722A | Gland packing | Emerging Cross-Sectional Technologies | 28 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.