ROLLS-ROYCE plc
4,090Patents
3,035Active
4,090Granted
61Portfolio score
Filing activity: Dec 1, 1976 → Mar 25, 2025 · 585 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4827712A | Turbofan gas turbine engine | Mechanical Engineering; Lighting; Heating | 237 | Expired |
| US5694765A | Shaft power transfer in gas turbine engines with machines operable as generators or motors | Emerging Cross-Sectional Technologies | 160 | Expired |
| US7465512B2 | Solid oxide fuel cell stack | Emerging Cross-Sectional Technologies | 156 | Expired |
| US5746391A | Mounting for coupling a turbofan gas turbine engine to an aircraft structure | Emerging Cross-Sectional Technologies | 140 | Expired |
| US4782658A | Deicing of a geared gas turbine engine | Emerging Cross-Sectional Technologies | 127 | Expired |
| US5867979A | Gas turbine engine system | Mechanical Engineering; Lighting; Heating | 125 | Expired |
| US6071077A | Swept fan blade | Emerging Cross-Sectional Technologies | 124 | Expired |
| US5062768A | Cooled turbomachinery components | Emerging Cross-Sectional Technologies | 122 | Expired |
| US4916293A | Identification in manufacture | Physics | 121 | Expired |
| US5458857A | Combined reformer and shift reactor | Emerging Cross-Sectional Technologies | 120 | Expired |
| US10137500B2 | Method of manufacturing a component | Emerging Cross-Sectional Technologies | 115 | Active |
| US10046412B2 | Method of manufacturing a component | Emerging Cross-Sectional Technologies | 114 | Active |
| US7162875B2 | Method and system for controlling fuel supply in a combustion turbine engine | Mechanical Engineering; Lighting; Heating | 113 | Expired |
| US5107676A | Reduction gear assembly and a gas turbine engine | Mechanical Engineering; Lighting; Heating | 110 | Expired |
| US7591183B2 | Gas turbine engine with a plurality of bleed valves | Physics | 110 | Active |
| US5497961A | Gas turbine engine nacelle assembly | Performing Operations; Transporting | 109 | Expired |
| US6253555A | Combustion chamber comprising mixing ducts with fuel injectors varying in number and cross-sectional area | Emerging Cross-Sectional Technologies | 109 | Expired |
| US4756536A | Brush seal | Emerging Cross-Sectional Technologies | 109 | Expired |
| US10052712B2 | Method of manufacturing a component | Emerging Cross-Sectional Technologies | 108 | Active |
| US4751816A | Turbofan gas turbine engine | Mechanical Engineering; Lighting; Heating | 100 | Expired |
| US6004620A | Method of unblocking an obstructed cooling passage | Mechanical Engineering; Lighting; Heating | 98 | Expired |
| US6332313A | Combustion chamber with separate, valved air mixing passages for separate combustion zones | Emerging Cross-Sectional Technologies | 97 | Expired |
| US6794781B2 | Compact electrical machine | Emerging Cross-Sectional Technologies | 96 | Expired |
| US6513334B2 | Combustion chamber | Mechanical Engineering; Lighting; Heating | 91 | Expired |
| US5743079A | Turbine engine control system | Mechanical Engineering; Lighting; Heating | 91 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.