| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | Canada | 6 | |
| #3 | EPO (European Patent Office) | 1 | |
| #4 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Mechanical elements | |
| #3 | Machines | |
| #4 | Packaging and shipping | |
| #5 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Pistons and sealings | |
| #2 | Unspecified technologies | |
| #3 | Mixing | |
| #4 | Drying solid materials by removing liquid | |
| #5 | Fluid fuel combustion | |
| #6 | Transport or storage devices | |
| #7 | Separation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Christian Robert F | 9 |
| #2 | Butterfield John P | 2 |
| #3 | Wolff Erland | 1 |
| #4 | Christian Robert Francis | 1 |
| #5 | Butterfield John Parker | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4530432A | Screw conveyer | |
| US4504222A | Screw conveyer and furnace | |
| US4408769A | Stuffing box with outer flexible tube to allow shaft gyratory movements | |
| US4330135A | Stuffing box with bellows to allow shaft gyratory movements | |
| US4297208A | Inclined helical flight conveyor | |
| US4408944A | Conveyor for removal of bed drain material from a coal-burning fluidized bed combustor | |
| US4040768A | Mixing, conveying heating and/or cooling apparatus |