Frick Company
31Patents
0Active
31Granted
35Portfolio score
Filing activity: May 6, 1975 → May 21, 1991
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4227862A | Solid state compressor control system | Mechanical Engineering; Lighting; Heating | 114 | Expired |
| US4336001A | Solid state compressor control system | Mechanical Engineering; Lighting; Heating | 80 | Expired |
| US4609329A | Micro-processor control of a movable slide stop and a movable slide valve in a helical screw rotary compressor with an enconomizer inlet port | Mechanical Engineering; Lighting; Heating | 75 | Expired |
| US4548549A | Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current | Mechanical Engineering; Lighting; Heating | 64 | Expired |
| US4434112A | Heat transfer surface with increased liquid to air evaporative heat exchange | Emerging Cross-Sectional Technologies | 42 | Expired |
| US4151724A | Pressurized refrigerant feed with recirculation for compound compression refrigeration systems | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US4519748A | Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current | Mechanical Engineering; Lighting; Heating | 29 | Expired |
| US4690759A | Centrifugal and impingement oil separator | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US4516914A | Micro-processor control of moveable slide stop and a moveable slide valve in a helical screw rotary compressor | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US4378680A | Shell and tube ice-maker with hot gas defrost | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US4437813A | Gas receiving and transmitting system | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4678406A | Variable volume ratio screw compressor with step control | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US3994638A | Oscillating rotary compressor | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US3986801A | Screw compressor | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US4465446A | Radial and thrust bearing mountings providing independent loading | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US4515540A | Variable liquid refrigerant injection port locator for screw compressor equipped with automatic variable volume ratio | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US5134856A | Oil pressure maintenance for screw compressor | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4324109A | Ice-making apparatus with hot gas defrost | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US4068981A | Blade-type rotary compressor with full unloading and oil sealed interfaces | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US4185467A | Icemaker liquid refrigerant defrost system | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US4840033A | Ice builder and control system therefor | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US4227380A | Single casing, multiple duty valve | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US4457681A | Volume ratio control means for axial flow helical screw type compressor | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US4325226A | Refrigeration system condenser heat recovery at higher temperature than normal condensing temperature | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4402189A | Refrigeration system condenser heat recovery at higher temperature than normal condensing temperature | Mechanical Engineering; Lighting; Heating | 5 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.