ZefTek, Inc.
41Patents
1Active
41Granted
37Portfolio score
Filing activity: Jul 24, 1987 → Mar 22, 2006 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5239933A | Auto rack panel gap sealer and bumper | Performing Operations; Transporting | 37 | Expired |
| US5145076A | Plastic knuckle pin with annular relief grooves for preventing pin failure due to fatigue | Performing Operations; Transporting | 33 | Expired |
| US6926480B2 | Supplemental restraint for auto-rack railroad car restraint system | Performing Operations; Transporting | 33 | Expired |
| US5669745A | Bumper system for an intermodal auto trailer | Performing Operations; Transporting | 31 | Expired |
| US7128508B2 | Supplemental restraint for auto-rack railroad car restraint system | Performing Operations; Transporting | 30 | Expired |
| US4917021A | Door finger guide for doors on auto rack cars | Performing Operations; Transporting | 28 | Expired |
| US5579697A | Auto rack panel gap sealing device | Emerging Cross-Sectional Technologies | 28 | Expired |
| US6050199A | Hatch cover sealing device | Performing Operations; Transporting | 27 | Expired |
| US5960980A | Vented hatch cover | Emerging Cross-Sectional Technologies | 27 | Expired |
| US5630519A | Plastic knuckle pin | Performing Operations; Transporting | 26 | Expired |
| US7150592B2 | Supplemental restraint for auto-rack railroad car restraint system | Performing Operations; Transporting | 24 | Expired |
| US5415108A | Auto rack panel gap sealer | Performing Operations; Transporting | 23 | Expired |
| US6561740B1 | Auto rack railroad car panel bumper guard | Performing Operations; Transporting | 23 | Expired |
| US7004696B2 | Supplemental restraint for auto-rack railroad car restraint system | Performing Operations; Transporting | 22 | Expired |
| US5701825A | Gap closing device for closing side wall gaps in auto rack cars | Performing Operations; Transporting | 20 | Expired |
| US5924654A | Railroad car sensing system | Performing Operations; Transporting | 20 | Expired |
| US4784068A | Segmented sliding sill wear plate | Performing Operations; Transporting | 19 | Expired |
| US4913062A | Segmented sliding sill wear plate | Performing Operations; Transporting | 19 | Expired |
| US6708625B1 | Greaseless door lock | Emerging Cross-Sectional Technologies | 18 | Expired |
| US6553917B1 | Auto rack railroad car bumper guard device | Performing Operations; Transporting | 18 | Expired |
| US5694859A | Hole covering device for an auto rack car side wall panel | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5682964A | Brake beam wear plate | Performing Operations; Transporting | 14 | Expired |
| US5975818A | Grating lift pad | Performing Operations; Transporting | 13 | Expired |
| US5598936A | Coupler carrier wear plate for long-shank couplers | Performing Operations; Transporting | 12 | Expired |
| US6367590B1 | Cushioned brake beam wear plate | Performing Operations; Transporting | 12 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.