Transitions Optical, Ltd.
209Patents
154Active
209Granted
57Portfolio score
Filing activity: Feb 24, 1992 → Aug 16, 2023 · 43 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5645767A | Photochromic indeno-fused naphthopyrans | Physics | 243 | Expired |
| US5274132A | Photochromic naphthopyran compounds | Physics | 218 | Expired |
| US5405958A | Photochromic spiro(indoline)naphthoxazine compounds | Physics | 191 | Expired |
| US5384077A | Photochromic naphthopyran compounds | Physics | 183 | Expired |
| US6113814A | Polymerizable polyalkoxylated naphthopyrans | Physics | 182 | Expired |
| US5466398A | Photochromic substituted naphthopyran compounds | Chemistry; Metallurgy | 178 | Expired |
| US5238981A | Photochromic naphthopyrans | Chemistry; Metallurgy | 172 | Expired |
| US5429774A | Benzopyran compounds | Physics | 161 | Expired |
| US6150430A | Process for adhering a photochromic coating to a polymeric substrate | Emerging Cross-Sectional Technologies | 161 | Expired |
| US5658501A | Substituted naphthopyrans | Physics | 156 | Expired |
| US5458814A | Substituted naphthopyrans | Physics | 155 | Expired |
| US6025026A | Process for producing an adherent polymeric layer on polymeric substrates and articles produced thereby | Physics | 153 | Expired |
| US5391327A | Photochromic compositions of improved fatigue resistance | Chemistry; Metallurgy | 150 | Expired |
| US6555028B2 | Polymeric matrix compatibilized naphthopyrans | Physics | 132 | Expired |
| US5451344A | Photochromic naphthopyran compounds | Physics | 100 | Expired |
| US5411679A | Benzopyrans | Physics | 96 | Expired |
| US7256921B2 | Polarizing, photochromic devices and methods of making the same | Emerging Cross-Sectional Technologies | 94 | Expired |
| US5369158A | Photochromic naphthopyrans | Chemistry; Metallurgy | 85 | Expired |
| US6433043B1 | Removable imbibition composition of photochromic compound and kinetic enhancing additive | Performing Operations; Transporting | 83 | Expired |
| US6630597B1 | Photochromic 6-aryl substituted 3H-naphtho(2,1-b)pyrans | Chemistry; Metallurgy | 81 | Expired |
| US5464567A | Photochromic tetraphenyl naphthodipyrans | Physics | 80 | Expired |
| US5458815A | Photochromic naphthopyran compounds | Physics | 75 | Expired |
| US5753146A | Photochromic naphthopyran compositions of neutral color | Physics | 69 | Expired |
| US7189456B2 | Photochromic optical article | Emerging Cross-Sectional Technologies | 63 | Expired |
| US5651923A | Substituted naphthopyrans | Chemistry; Metallurgy | 60 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.