Robert Langley
25Patents
7h-index
17Co-inventors
66Inventor score
Filing activity: Nov 7, 1974 → May 14, 1998
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5279654A | Phthalocyanine pigment compositions | Chemistry; Metallurgy | 25 | Expired |
| US4076894A | Electrical circuit element comprising thick film resistor bonded to conductor | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4104277A | Process for preparing an alpha or beta form copper phthalocyanine pigment | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4364814A | Apparatus for the production of aqueous alkali metal hypochlorite | Chemistry; Metallurgy | 10 | Expired |
| US4293513A | Method of making honeycomb structures | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4152171A | Preparation of .alpha.- .beta.- and .gamma.-copper phthalocyanine pigments | Chemistry; Metallurgy | 8 | Expired |
| US3951672A | Glass frit containing lead ruthenate or lead iridate in relatively uniform dispersion and method to produce same | Chemistry; Metallurgy | 8 | Expired |
| US5776238A | Production of pigments | Chemistry; Metallurgy | 7 | Expired |
| US4426262A | Promotion of Pt-Ir catalytic electrodes with lead, tantalum, ruthenium and oxygen | Chemistry; Metallurgy | 7 | Expired |
| US5250111A | Pigment compositions | Chemistry; Metallurgy | 6 | Expired |
| US5964929A | Process for the production of ink concentrates | Chemistry; Metallurgy | 6 | Expired |
| US4981888A | Resin compositions | Chemistry; Metallurgy | 6 | Expired |
| US5449774A | Production of beta form pigmentary copper phthalocyanine | Chemistry; Metallurgy | 5 | Expired |
| US4313766A | Process for the production of a pigment composition | Chemistry; Metallurgy | 5 | Expired |
| US4801638A | Production of pigmentary copper phthalocyanine | Performing Operations; Transporting | 4 | Expired |
| US4091028A | Production of phthalocyanine green | Chemistry; Metallurgy | 4 | Expired |
| US4920217A | Production of dimethylaminomethyl copper phthalocyanine | Chemistry; Metallurgy | 3 | Expired |
| US4252565A | Stabilized phthalocyanines | Chemistry; Metallurgy | 3 | Expired |
| US4694078A | Production of pigmentary copper phthalocyanine | Performing Operations; Transporting | 3 | Expired |
| US4801634A | Production of pigmentary copper phthalocyanine | Performing Operations; Transporting | 2 | Expired |
| US4186066A | Electrolysis cathodes with Ag-Ti intermetallic coating | Chemistry; Metallurgy | 2 | Expired |
| US4512866A | Titanium-lead anode for use in electrolytic processes employing sulfuric acid | Chemistry; Metallurgy | 2 | Expired |
| US6031030A | Production process | Chemistry; Metallurgy | 1 | Expired |
| US5614013A | Pigment compositions | Chemistry; Metallurgy | 1 | Expired |
| US5212221A | Stabilized phthalocyanine pigment compositions | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.