Hirotaka Tomizawa
29Patents
10h-index
29Co-inventors
71Inventor score
Filing activity: May 28, 1987 → Aug 22, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5185092A | Lubricating oil for refrigerator | Chemistry; Metallurgy | 75 | Expired |
| US6667285B1 | Lubricating oil for refrigerator, hydraulic fluid composition for refrigerator and method for lubricating of refrigerator | Chemistry; Metallurgy | 51 | Expired |
| US5356547A | Lubricating oil composition containing friction modifier and corrosion inhibitor | Chemistry; Metallurgy | 32 | Expired |
| US5719109A | Lubricating oil composition | Chemistry; Metallurgy | 29 | Expired |
| US5688748A | Lubricating oil composition for internal combustion engines | Chemistry; Metallurgy | 25 | Expired |
| US5605880A | Lubricating oil composition | Chemistry; Metallurgy | 22 | Expired |
| US5259978A | Traction fluid composition comprising a cyclohexyl diester and branched poly-.alpha.-olefin | Chemistry; Metallurgy | 19 | Expired |
| US5364545A | Lubricating oil composition containing friction modifier and corrosion inhibitor | Chemistry; Metallurgy | 13 | Expired |
| US5344582A | Traction fluid derived from cyclopentadiene oligomers | Chemistry; Metallurgy | 12 | Expired |
| US6855675B1 | Lubricating oil composition | Chemistry; Metallurgy | 10 | Expired |
| US5266229A | Stable electro-rheological fluid having a high viscosity-increasing effect | Chemistry; Metallurgy | 10 | Expired |
| US4886614A | Synthetic traction fluid | Chemistry; Metallurgy | 9 | Expired |
| US5387370A | Electroviscous fluid | Chemistry; Metallurgy | 9 | Expired |
| US5880073A | Lubricating oil composition | Chemistry; Metallurgy | 8 | Expired |
| US5334319A | Composition for hydraulic lubrication and coupling | Chemistry; Metallurgy | 6 | Expired |
| US7517838B2 | Lubricating oil for bearing | Chemistry; Metallurgy | 6 | Expired |
| US6403541B1 | Oil filter clogging preventing agent and oil filter clogging preventing method, and engine oil compositions comprising said oil filter clogging preventing agent | Chemistry; Metallurgy | 6 | Expired |
| US5039440A | Traction fluid | Chemistry; Metallurgy | 5 | Expired |
| US4978468A | Traction fluid | Chemistry; Metallurgy | 5 | Expired |
| US4886613A | Traction fluid | Chemistry; Metallurgy | 5 | Expired |
| US5266230A | Electroviscous fluid containing antioxidant and/or corrosion inhibitor | Chemistry; Metallurgy | 5 | Expired |
| US4889650A | Synthetic traction fluid | Chemistry; Metallurgy | 5 | Expired |
| US5696063A | Basic metal salt of dithiocarbamic acid and lubricating oil composition containing said salt | Chemistry; Metallurgy | 5 | Expired |
| US5332515A | Fluid for viscous coupling | Chemistry; Metallurgy | 4 | Expired |
| US5075024A | Synthetic traction fluid | Chemistry; Metallurgy | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.