TECHCO HOLDINGS, INC.
43Patents
4Active
43Granted
50Portfolio score
Filing activity: Oct 6, 1988 → Mar 24, 2023 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6370459B1 | Feedback and servo control for electric power steering systems | Performing Operations; Transporting | 101 | Expired |
| US6152254A | Feedback and servo control for electric power steering system with hydraulic transmission | Performing Operations; Transporting | 99 | Expired |
| US5307892A | Electronically controlled power steering system | Performing Operations; Transporting | 96 | Expired |
| US4956590A | Vehicular power steering system | Performing Operations; Transporting | 57 | Expired |
| US5435698A | Bootstrap power steering systems | Electricity | 34 | Expired |
| US5475976A | Method and apparatus for reduction of fluid borne noise in hydraulic systems | Mechanical Engineering; Lighting; Heating | 34 | Expired |
| US6122912A | Electro-hydraulic power steering systems having improved efficiency | Performing Operations; Transporting | 28 | Expired |
| US5682745A | Bootstrap power steering systems | Electricity | 26 | Expired |
| US5072650A | Power steering system with improved stability | Performing Operations; Transporting | 25 | Expired |
| US5316043A | Preload mechanism for power steering apparatus | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5103715A | Power steering system | Performing Operations; Transporting | 21 | Expired |
| US6119540A | Yoke apparatus for rack and pinion | Emerging Cross-Sectional Technologies | 19 | Expired |
| US5311906A | Preload mechanism for power steering apparatus | Emerging Cross-Sectional Technologies | 18 | Expired |
| US5755097A | Bootstrap power steering systems | Performing Operations; Transporting | 18 | Expired |
| US6142031A | Yoke apparatus for rack and pinion | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5582006A | Method and apparatus for reduction of fluid borne noise in hydraulic systems | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US5791141A | Method and apparatus for reduction of fluid borne noise in hydraulic systems | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US7670122B2 | Gerotor pump | Mechanical Engineering; Lighting; Heating | 14 | Active |
| US5273072A | Flow passages for control valves | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5718149A | Yoke apparatus for rack and pinion | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5931046A | Yoke apparatus for rack and pinion | Emerging Cross-Sectional Technologies | 12 | Expired |
| US5660078A | Yoke apparatus for rack and pinion | Emerging Cross-Sectional Technologies | 11 | Expired |
| US5845532A | Yoke apparatus for rack and pinion | Emerging Cross-Sectional Technologies | 11 | Expired |
| US5802919A | Yoke apparatus for rack and pinion | Emerging Cross-Sectional Technologies | 10 | Expired |
| US5697216A | Method and apparatus for reduction of fluid borne noise in hydraulic systems | Mechanical Engineering; Lighting; Heating | 10 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.