Gregory L. Johnston
15Patents
6h-index
23Co-inventors
66Inventor score
Filing activity: Aug 17, 1994 → Oct 16, 2017
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6009902A | Dual valve fitting for enabling quick measurement of pressure | Emerging Cross-Sectional Technologies | 61 | Expired |
| US11547793B2 | Fluid injector with syringe engagement mechanism | Human Necessities | 10 | Active |
| US5869765A | Dual seal fitting for enabling quick measurement of brake cylinder pressure | Physics | 9 | Expired |
| US5503011A | Test connector for automatic test device | Performing Operations; Transporting | 9 | Expired |
| US5634696A | Railway brake pipe bracket with access ports | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US5869754A | Dual seal coupling apparatus for enabling quick measurement of brake cylinder pressure | Performing Operations; Transporting | 8 | Expired |
| US6164312A | Purge valve | Emerging Cross-Sectional Technologies | 5 | Expired |
| US10364590B1 | Fence post puller and puller-driver combination | Performing Operations; Transporting | 5 | Active |
| US5952566A | Dual valve apparatus for enabling quick measurement of pressure | Performing Operations; Transporting | 5 | Expired |
| US6089268A | Dual valve fitting for enabling quick measurement of pressure | Emerging Cross-Sectional Technologies | 4 | Expired |
| US6070854A | Dual valve fitting for enabling quick measurement of pressure | Emerging Cross-Sectional Technologies | 4 | Expired |
| US6170511A | Normally open purge valve | Emerging Cross-Sectional Technologies | 3 | Expired |
| US6029700A | Dual valve fitting for enabling quick measurement of pressure | Emerging Cross-Sectional Technologies | 2 | Expired |
| US5518304A | Filter arrangement and mounting in railway brake pipe bracket | Performing Operations; Transporting | 1 | Expired |
| US6416059B1 | Brass insert molded into “church window” of service accelerated release valve gasket | Mechanical Engineering; Lighting; Heating | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.