Norman Johnson
15Patents
8h-index
41Co-inventors
72Inventor score
Filing activity: Nov 15, 1985 → Apr 19, 2017
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4652685A | Hydrogenation of lactones to glycols | Chemistry; Metallurgy | 99 | Expired |
| US6630568B1 | Method for purification of aromatic polyethers | Chemistry; Metallurgy | 36 | Expired |
| US6251354A | Process for recovering sodium nitrite | Chemistry; Metallurgy | 31 | Expired |
| US6949622B2 | Method of separating a polymer from a solvent | Performing Operations; Transporting | 23 | Expired |
| US7115785B2 | Method for making salts hydroxy-substituted hydrocarbons | Chemistry; Metallurgy | 19 | Expired |
| US6790934B2 | Method for purification of aromatic polyethers | Chemistry; Metallurgy | 19 | Expired |
| US7714095B2 | Phase transfer catalyzed method for preparation of polyetherimides | Chemistry; Metallurgy | 13 | Active |
| US7125954B2 | Method for producing polyether polymers | Chemistry; Metallurgy | 13 | Expired |
| US7122619B2 | Method of separating a polymer from a solvent | Performing Operations; Transporting | 8 | Expired |
| US8372941B2 | Method for purification of polyether polymers and mixtures resulting therefrom | Chemistry; Metallurgy | 6 | Active |
| US9181395B2 | Optimized emulsion drying process for making micronized polyetherimide polymers | Emerging Cross-Sectional Technologies | 5 | Active |
| US5030773A | Process for the production of butanediol | Chemistry; Metallurgy | 3 | Expired |
| US10407397B2 | Method for isolation of a dianhydride and dianhydrides prepared by the method | Chemistry; Metallurgy | 3 | Active |
| US8592548B2 | Method to prepare bis(haloimides) | Chemistry; Metallurgy | 0 | Expired |
| US8729214B2 | Mixtures resulting from methods for purification of polyether polymers | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.