John E. Tschirky
18Patents
13h-index
5Co-inventors
63Inventor score
Filing activity: Nov 14, 1973 → Jun 8, 1981
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4029368A | Radial bearings | Emerging Cross-Sectional Technologies | 71 | Expired |
| US4133396A | Drilling and casing landing apparatus and method | Fixed Constructions | 68 | Expired |
| US4117895A | Apparatus and method for enlarging underground arcuate bore holes | Fixed Constructions | 57 | Expired |
| US3989114A | Circulation sub for in-hole hydraulic motors | Fixed Constructions | 32 | Expired |
| US4329127A | Sealed bearing means for in hole motors | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US3999901A | Progressive cavity transducer | Mechanical Engineering; Lighting; Heating | 29 | Expired |
| US3975121A | Wafer elements for progressing cavity stators | Mechanical Engineering; Lighting; Heating | 26 | Expired |
| US3982858A | Segmented stator for progressive cavity transducer | Emerging Cross-Sectional Technologies | 24 | Expired |
| US3982859A | Floating flow restrictors for fluid motors | Fixed Constructions | 23 | Expired |
| US3975120A | Wafer elements for progressing cavity stators | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US4386666A | In-hole motor drill with locking bit clutch | Fixed Constructions | 20 | Expired |
| US3936247A | Floating flow restrictors for fluid motors | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US4220380A | Bearing assembly | Emerging Cross-Sectional Technologies | 15 | Expired |
| US3982797A | Spring-loaded bearings for in-hole motors | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US4098561A | Sealed bearings | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US4562853A | Downhole fire control | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4133397A | Drilling with multiple in-hole motors | Fixed Constructions | 9 | Expired |
| US4213508A | Downhole fire control | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.