Otisca Industries, Ltd.
20Patents
0Active
20Granted
33Portfolio score
Filing activity: Apr 12, 1974 → Dec 30, 1987
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4151003A | Viscosity modification of bituminous materials | Chemistry; Metallurgy | 35 | Expired |
| US4484928A | Methods for processing coal | Chemistry; Metallurgy | 28 | Expired |
| US4770766A | Time-controlled processes for agglomerating coal | Performing Operations; Transporting | 26 | Expired |
| US3941679A | Separation of hydrocarbonaceous substances from mineral solids | Chemistry; Metallurgy | 24 | Expired |
| US4173530A | Methods of and apparatus for cleaning coal | Performing Operations; Transporting | 21 | Expired |
| US4248698A | Coal recovery process | Chemistry; Metallurgy | 21 | Expired |
| US4244699A | Treating and cleaning coal methods | Chemistry; Metallurgy | 20 | Expired |
| US4027731A | Methods of and apparatus for hydrocarbon recovery | Fixed Constructions | 20 | Expired |
| US4265737A | Methods and apparatus for transporting and processing solids | Performing Operations; Transporting | 19 | Expired |
| US4249699A | Coal recovery processes utilizing agglomeration and density differential separations | Performing Operations; Transporting | 17 | Expired |
| US4252639A | Coal beneficiation processes | Performing Operations; Transporting | 17 | Expired |
| US4224039A | Coal briquetting methods | Chemistry; Metallurgy | 12 | Expired |
| US4178231A | Method and apparatus for coal separation using fluorinated hydrocarbons | Performing Operations; Transporting | 9 | Expired |
| US4461625A | Methods of cleaning coal | Chemistry; Metallurgy | 9 | Expired |
| US4936513A | Ball mills | Performing Operations; Transporting | 6 | Expired |
| US4447245A | Methods of cleaning coal | Chemistry; Metallurgy | 6 | Expired |
| US4178233A | Fluorinated hydrocarbons in coal mining and beneficiation | Performing Operations; Transporting | 5 | Expired |
| US4089340A | Viscosity modification of hydrocarbonaceous materials | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4186887A | Processes for recovering coal | Performing Operations; Transporting | 4 | Expired |
| US4274946A | Agglomeration type coal recovery processes | Chemistry; Metallurgy | 4 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.