| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 6 | |
| #2 | Canada | 4 | |
| #3 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Rotary-pistons | |
| #2 | Milling | |
| #3 | Clutches and brakes | |
| #4 | Pistons and sealings | |
| #5 | Unspecified technologies | |
| #6 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Allen Clifford H | 9 |
| #2 | Allen Clifford Harry | 1 |
| #3 | Clifford Harry Allen | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4185839A | Packing gland for pump shaft seal | |
| CA1091050A | Flexible shaft assembly for progressing cavity pump | |
| US4153397A | Rotor drive coupling for progressing cavity pump | |
| US4140444A | Flexible shaft assembly for progressing cavity pump | |
| US4033144A | Flexible coupling | |
| US3938744A | Positive displacement rotary pump and drive coupling therefor | |
| US3512904A | Progressing cavity helical pump | |
| CA913989A | Progressing cavity helical pump |