Duane D. Robertson
7Patents
3Active
7Granted
38Portfolio score
Filing activity: Jul 29, 1974 → Jul 27, 2011 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US3980325A | Fitting for flexible plastic pipe | Mechanical Engineering; Lighting; Heating | 81 | Expired |
| US6370780B1 | Spring-biased cutting tool for plastic pipes | Performing Operations; Transporting | 27 | Expired |
| US8024864B2 | Ratcheting cutting tool for plastic pipes | Performing Operations; Transporting | 18 | Active |
| US6318761A | Replacement fitting for rigid, plastic pipes | Emerging Cross-Sectional Technologies | 14 | Expired |
| US7150289B2 | Removable, snap-on saddle and tap for irrigation pipes | Emerging Cross-Sectional Technologies | 9 | Expired |
| US7549226B2 | Self-locking cutting tool for plastic pipes | Performing Operations; Transporting | 5 | Active |
| US8328241B1 | Clampless fitting for plastic pipes | Mechanical Engineering; Lighting; Heating | 3 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.