Rolfe J. Hartley
33Patents
16h-index
38Co-inventors
81Inventor score
Filing activity: Sep 16, 1988 → Jan 24, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5652201A | Lubricating oil compositions and concentrates and the use thereof | Chemistry; Metallurgy | 107 | Expired |
| US4857214A | Oil-soluble phosphorus antiwear additives for lubricants | Chemistry; Metallurgy | 106 | Expired |
| US6300291A | Lubricating oil composition | Chemistry; Metallurgy | 70 | Expired |
| US6723685B2 | Lubricating oil composition | Chemistry; Metallurgy | 68 | Expired |
| US6074993A | Lubricating oil composition containing two molybdenum additives | Chemistry; Metallurgy | 50 | Expired |
| US5089156A | Ashless or low-ash synthetic base compositions and additives therefor | Chemistry; Metallurgy | 36 | Expired |
| US6333298A | Molybdenum-free low volatility lubricating oil composition | Chemistry; Metallurgy | 32 | Expired |
| US5344579A | Friction modifier compositions and their use | Chemistry; Metallurgy | 31 | Expired |
| US5358650A | Gear oil compositions | Chemistry; Metallurgy | 28 | Expired |
| US5372735A | Automatic transmission fluids and additives therefor | Chemistry; Metallurgy | 27 | Expired |
| US6096691A | Gear oil additive concentrates and lubricants containing them | Chemistry; Metallurgy | 27 | Expired |
| US5441656A | Automatic transmission fluids and additives therefor | Chemistry; Metallurgy | 20 | Expired |
| US7485603B2 | Soot dispersants and lubricating oil compositions containing same | Chemistry; Metallurgy | 20 | Active |
| US7022653B2 | Friction modifiers for engine oil composition | Chemistry; Metallurgy | 19 | Expired |
| US5571445A | Gear oil compositions | Chemistry; Metallurgy | 18 | Expired |
| US5962378A | Synergistic combinations for use in functional fluid compositions | Chemistry; Metallurgy | 16 | Expired |
| US6500786B1 | Lubricating oil composition | Chemistry; Metallurgy | 15 | Expired |
| US5387346A | Automatic transmission fluids and additives therefor | Chemistry; Metallurgy | 15 | Expired |
| US5360562A | Ashless or low-ash synthetic base compositions and additives therefor | Chemistry; Metallurgy | 15 | Expired |
| US5880075A | Synthetic biodegradable lubricants and functional fluids | Chemistry; Metallurgy | 10 | Expired |
| US8530397B2 | Additive compositions | Chemistry; Metallurgy | 9 | Active |
| US5573696A | Oil-soluble phosphorus- and nitrogen-containing additives | Chemistry; Metallurgy | 7 | Expired |
| US5500140A | Oil-soluble phosphorus- and nitrogen-containing additives | Chemistry; Metallurgy | 6 | Expired |
| US6852679B2 | Lubricating oil composition | Chemistry; Metallurgy | 6 | Expired |
| US6642188B1 | Lubricating oil composition for outboard engines | Chemistry; Metallurgy | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.