Robert E. Gray
24Patents
12h-index
21Co-inventors
81Inventor score
Filing activity: Jan 14, 1976 → Nov 16, 2006
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5404577A | Combination head-protective helmet & communications system | Electricity | 140 | Expired |
| US4667459A | Two action control for power mowers | Emerging Cross-Sectional Technologies | 47 | Expired |
| US4844467A | Chance selection device | Human Necessities | 45 | Expired |
| US5200736A | Assembly for monitoring helmet thermal conditions | Human Necessities | 40 | Expired |
| US5097826A | Pressure monitoring device for self-contained breathing apparatus | Human Necessities | 34 | Expired |
| US4449524A | Self-contained breathing apparatus with provision for shared use | Human Necessities | 31 | Expired |
| USD275616S | Pressure regulator control module for self-contained breathing apparatus | General | 30 | Expired |
| USD412486S | Battery housing | General | 29 | Expired |
| US5271390A | Positive pressure breathing assembly and demand regulator therefor | Human Necessities | 25 | Expired |
| US5678205A | Combination head-protective helmet and communications system | Electricity | 23 | Expired |
| US6032664A | Pressure display for self contained breathing apparatus | Performing Operations; Transporting | 14 | Expired |
| US5375972A | Turbine stator vane structure | Emerging Cross-Sectional Technologies | 14 | Expired |
| US8150568B1 | Rail synthetic vision system | Performing Operations; Transporting | 12 | Active |
| US5640148A | Dual activation alarm system | Physics | 12 | Expired |
| US4090511A | Mouthpiece valve for escape breathing apparatus | Performing Operations; Transporting | 12 | Expired |
| US4928685A | Closed-circuit positive pressure breathing apparatus with pneumatically operated storage chamber | Human Necessities | 8 | Expired |
| US4007758A | Respirator pressure-demand exhalation valve | Emerging Cross-Sectional Technologies | 8 | Expired |
| US5000174A | Positive pressure breathing assembly and demand regulator therefor | Performing Operations; Transporting | 7 | Expired |
| US4069581A | Muffin splitter | Human Necessities | 6 | Expired |
| US4731617A | Apparatus and method for making paraboloidal surfaces | Electricity | 5 | Expired |
| US5303534A | Seal for drive unit | Emerging Cross-Sectional Technologies | 4 | Expired |
| US6050261A | Combination backframe and self contained breathing apparatus | Human Necessities | 4 | Expired |
| USD358400S | Lawn mower | General | 2 | Expired |
| US6074779A | Battery cell housing | Electricity | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.