CRA Services Limited
16Patents
0Active
16Granted
32Portfolio score
Filing activity: Feb 15, 1984 → May 2, 1995
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5489325A | Process for producing metals and metal alloys in a smelt reduction vessel | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4951825A | Apparatus for classifying particulate material | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5302184A | Manufacture of ferroalloys using a molten bath reactor | Chemistry; Metallurgy | 26 | Expired |
| US5647888A | Process for producing metals and metal alloys in a smelt reduction vessel | Emerging Cross-Sectional Technologies | 23 | Expired |
| US4758244A | Upgrading solid fuels | Chemistry; Metallurgy | 22 | Expired |
| US5260040A | Extraction and recovery of gold | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4741770A | Zinc smelting process using oxidation zone and reduction zone | Chemistry; Metallurgy | 8 | Expired |
| US5316268A | Method for increasing the durability of refractory vessel linings | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US5088331A | Apparatus for measuring a mass stream | Physics | 5 | Expired |
| US4701184A | Upgrading solid fuels | Chemistry; Metallurgy | 4 | Expired |
| US4627575A | Upgrading solid fuels | Chemistry; Metallurgy | 4 | Expired |
| US5198019A | Manufacture of iron and steel in a duplex smelter and solid state oxide suspension prereducer | Emerging Cross-Sectional Technologies | 4 | Expired |
| US5262136A | Recovery of gold and silver from complex refractory sulphide ores by cyanidisation and oxidation with peroxides | Emerging Cross-Sectional Technologies | 3 | Expired |
| US5201940A | Pre-heating and pre-reduction of a metal oxide | Emerging Cross-Sectional Technologies | 3 | Expired |
| US5227116A | Manufacture of iron and steel in a duplex smelter and solid state oxide suspension prereducer | Emerging Cross-Sectional Technologies | 2 | Expired |
| US5364446A | Heating and treatment of particulate material | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.