Hedley Purvis Limited
8Patents
0Active
8Granted
26Portfolio score
Filing activity: Jan 20, 1988 → Dec 28, 2000
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5032048A | Quick-fastening nut | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4998453A | Hydraulic bolt tensioner | Performing Operations; Transporting | 27 | Expired |
| US4854197A | Torque wrenches | Performing Operations; Transporting | 12 | Expired |
| US4982626A | Hydraulic torque wrench | Performing Operations; Transporting | 11 | Expired |
| US6581642B1 | Pipe testing apparatus | Physics | 10 | Expired |
| US5979273A | Torque wrench | Performing Operations; Transporting | 8 | Expired |
| US5142951A | Torque wrench | Performing Operations; Transporting | 6 | Expired |
| US5249486A | Torque wrench | Performing Operations; Transporting | 4 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.