John A. Hoffnagle
18Patents
8h-index
31Co-inventors
72Inventor score
Filing activity: May 12, 1992 → Aug 15, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5248883A | Ion traps of mono- or multi-planar geometry and planar ion trap devices | Electricity | 50 | Expired |
| US7079223B2 | Fast model-based optical proximity correction | Physics | 49 | Expired |
| US6295168A | Refractive optical system that converts a laser beam to a collimated flat-top beam | Physics | 43 | Expired |
| US6801368B2 | System for converting optical beams to collimated flat-top beams | Physics | 31 | Expired |
| US8982352B1 | Regular, stable optical frequency scale for cavity enhanced optical spectroscopy | Electricity | 21 | Active |
| US5379000A | Atomic clock employing ion trap of mono- or multi-planar geometry | Electricity | 16 | Expired |
| US6178000A | Monolithic symmetric interferometer for generation of variable-periodicity patterns for lithography | Physics | 15 | Expired |
| US6654183B2 | System for converting optical beams to collimated flat-top beams | Physics | 11 | Expired |
| US9267880B1 | Ring-down binning in FSR hopping mode | Physics | 6 | Active |
| US7046342B2 | Apparatus for characterization of photoresist resolution, and method of use | Emerging Cross-Sectional Technologies | 5 | Expired |
| US9645077B2 | Spectroscopic quantification of extremely rare molecular species in the presence of interfering optical absorption | Physics | 4 | Active |
| US7179571B2 | Apparatus for characterization of photoresist resolution, and method of use | Emerging Cross-Sectional Technologies | 3 | Expired |
| US6879448B2 | Apparatus for achromatizing optical beams | Physics | 3 | Expired |
| US7875408B2 | Bleachable materials for lithography | Emerging Cross-Sectional Technologies | 1 | Active |
| US11592388B2 | Clutter avoidance in wide-band cavity ring-down data acquisition | Physics | 0 | Active |
| US11035728B2 | Cavity ring-down spectroscopy having interleaved data acquisition for interference mitigation | Physics | 0 | Active |
| US11092493B2 | Cavity enhanced absorption spectroscopy using a piecewise tunable laser and hierarchical wavelength determination | Physics | 0 | Active |
| US12270706B2 | Cavity enhanced absorption spectroscopy using a piecewise tunable laser and hierarchical wavelength determination | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.