Craig A. Willkens
27Patents
12h-index
24Co-inventors
81Inventor score
Filing activity: Nov 26, 1986 → Mar 9, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5759481A | Silicon nitride having a high tensile strength | Chemistry; Metallurgy | 102 | Expired |
| US4970057A | Silicon nitride vacuum furnace process | Chemistry; Metallurgy | 94 | Expired |
| US5514630A | Composition for small ceramic igniters | Chemistry; Metallurgy | 94 | Expired |
| US5061416A | Process for the manufacture of friable silicon nitride bodies | Chemistry; Metallurgy | 48 | Expired |
| US4885199A | Fiber-reinforced silicon nitride composite ceramics | Emerging Cross-Sectional Technologies | 36 | Expired |
| US5229339A | Pressure casting ceramic slurries | Chemistry; Metallurgy | 23 | Expired |
| US5786565A | Match head ceramic igniter and method of using same | Chemistry; Metallurgy | 22 | Expired |
| US5892201A | Method of heating a stovetop range using a ceramic igniter | Chemistry; Metallurgy | 15 | Expired |
| US5785911A | Method of forming ceramic igniters | Chemistry; Metallurgy | 15 | Expired |
| US5571760A | Silicon nitride having a high tensile strength | Chemistry; Metallurgy | 13 | Expired |
| US6028292A | Ceramic igniter having improved oxidation resistance, and method of using same | Electricity | 13 | Expired |
| US5820789A | High voltage ceramic igniter | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US6562745B2 | Aging resistant, porous silicon Carbide ceramic igniter | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5801361A | Ceramic igniter with hot zone thickness of 0.019 inches or less | Electricity | 9 | Expired |
| US6278087A | Ceramic igniters and methods for using and producing same | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US6002107A | Method of heating a stovetop range using a continuously energized ceramic igniter having relight capability | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US6989048B2 | Particulate filter for purifying exhaust gases of internal combustion engines comprising hot spot ceramic ignitors | Emerging Cross-Sectional Technologies | 6 | Expired |
| US6474492B2 | Multiple hot zone igniters | Chemistry; Metallurgy | 6 | Expired |
| US6297183A | Aging resistant porous silicon carbide ceramic igniter | Emerging Cross-Sectional Technologies | 6 | Expired |
| US7329837B2 | Ceramic igniters | Emerging Cross-Sectional Technologies | 5 | Expired |
| US6582629B1 | Compositions for ceramic igniters | Electricity | 4 | Expired |
| US5004544A | Reaction bonded silicon nitride filtration membranes | Chemistry; Metallurgy | 3 | Expired |
| US8193469B2 | Ceramic igniters | Emerging Cross-Sectional Technologies | 3 | Active |
| US5510304A | Coarse reaction bonded silicon nitride | Chemistry; Metallurgy | 2 | Expired |
| US9951952B2 | Hot surface igniters and methods of making same | Electricity | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.