Portec, Inc.
🏢 View company profile →48Patents
0Active
48Granted
37Portfolio score
Filing activity: Jun 19, 1974 → Dec 6, 2005
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4437410A | Pivotal slidable vehicle end enclosure | Emerging Cross-Sectional Technologies | 34 | Expired |
| US4037513A | Cotter pin | Emerging Cross-Sectional Technologies | 29 | Expired |
| US3996860A | Vehicle end enclosure | Performing Operations; Transporting | 29 | Expired |
| US5394958A | Rail lubrication apparatus | Performing Operations; Transporting | 27 | Expired |
| US4084516A | Foldable slidable vehicle end enclosure | Fixed Constructions | 27 | Expired |
| US5294065A | Portable screening/dosing/mixing plant | Performing Operations; Transporting | 24 | Expired |
| US4451188A | Coil car with shiftable trough assemblies | Performing Operations; Transporting | 24 | Expired |
| US4776736A | Twin container hold down | Performing Operations; Transporting | 21 | Expired |
| US4887708A | Drive apparatus for belt power turns | Performing Operations; Transporting | 20 | Expired |
| US4930621A | Attachments for power turns | Performing Operations; Transporting | 20 | Expired |
| US4273052A | Spike driving apparatus | Fixed Constructions | 19 | Expired |
| US5348120A | Rail lubrication apparatus | Performing Operations; Transporting | 19 | Expired |
| US4524314A | Rear travel guidance system | Physics | 19 | Expired |
| US4430032A | Pedestal container locking device | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4974215A | Loading dock range finding system | Emerging Cross-Sectional Technologies | 18 | Expired |
| US5484111A | Hammers for hammer mills | Performing Operations; Transporting | 17 | Expired |
| US4726456A | Braking system for a molded fiberglass spiral chute | Performing Operations; Transporting | 16 | Expired |
| US5394977A | Apparatus and method for use in replacing conveyor belts | Performing Operations; Transporting | 15 | Expired |
| US4632308A | Adjustable rail fastener assembly | Fixed Constructions | 13 | Expired |
| US5598914A | Removable sidewall for a molded spiral chute | Performing Operations; Transporting | 13 | Expired |
| US4027216A | Control device for a synchronous motor | Electricity | 12 | Expired |
| US4444123A | Curved roof hooper car | Performing Operations; Transporting | 12 | Expired |
| US4263853A | Rail car end door positioning keeper assembly | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4273486A | Winch and chain attachment assembly | Emerging Cross-Sectional Technologies | 10 | Expired |
| US5732827A | Screening apparatus | Performing Operations; Transporting | 9 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.