David B. Knowles
63Patents
24h-index
48Co-inventors
88Inventor score
Filing activity: Dec 21, 1988 → Feb 17, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6687266B1 | Organic light emitting materials and devices | Electricity | 1,035 | Expired |
| US6835469B2 | Phosphorescent compounds and devices comprising the same | Emerging Cross-Sectional Technologies | 917 | Expired |
| US7087321B2 | Organic light emitting devices having reduced pixel shrinkage | Emerging Cross-Sectional Technologies | 821 | Expired |
| US5384077A | Photochromic naphthopyran compounds | Physics | 183 | Expired |
| US5238981A | Photochromic naphthopyrans | Chemistry; Metallurgy | 172 | Expired |
| US6296785A | Indeno-fused photochromic naphthopyrans | Physics | 162 | Expired |
| US5658501A | Substituted naphthopyrans | Physics | 156 | Expired |
| US5458814A | Substituted naphthopyrans | Physics | 155 | Expired |
| US6348604B1 | Photochromic naphthopyrans | Physics | 123 | Expired |
| US5451344A | Photochromic naphthopyran compounds | Physics | 100 | Expired |
| US5369158A | Photochromic naphthopyrans | Chemistry; Metallurgy | 85 | Expired |
| US5464567A | Photochromic tetraphenyl naphthodipyrans | Physics | 80 | Expired |
| US5458815A | Photochromic naphthopyran compounds | Physics | 75 | Expired |
| US5651923A | Substituted naphthopyrans | Chemistry; Metallurgy | 60 | Expired |
| US5573712A | Substituted naphthopyrans | Physics | 45 | Expired |
| US5514817A | Substituted phenanthropyrans | Chemistry; Metallurgy | 44 | Expired |
| US8142909B2 | Blue phosphorescent imidazophenanthridine materials | Emerging Cross-Sectional Technologies | 38 | Active |
| US5650098A | Substituted naphthopyrans | Physics | 36 | Expired |
| US5552090A | Photochromic naphthopyran compounds | Physics | 36 | Expired |
| US5565147A | Photochromic naphthopyran compounds | Physics | 34 | Expired |
| US5658500A | Substituted naphthopyrans | Physics | 33 | Expired |
| US5656206A | Substituted naphthopyrans | Chemistry; Metallurgy | 28 | Expired |
| US8158037B2 | Photochromic materials having extended pi-conjugated systems and compositions and articles including the same | Emerging Cross-Sectional Technologies | 25 | Active |
| US9028728B2 | Photochromic materials that include indeno-fused naphthopyrans | Emerging Cross-Sectional Technologies | 24 | Active |
| US7029765B2 | Organic light emitting devices having reduced pixel shrinkage | Emerging Cross-Sectional Technologies | 24 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.