Robert W. Shaffer
41Patents
19h-index
19Co-inventors
78Inventor score
Filing activity: Mar 24, 1975 → Jan 25, 2024
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4398110A | Harmonic electric actuator | Mechanical Engineering; Lighting; Heating | 104 | Expired |
| US3994636A | Axial compliance means with radial sealing for scroll-type apparatus | Mechanical Engineering; Lighting; Heating | 80 | Expired |
| US3994633A | Scroll apparatus with pressurizable fluid chamber for axial scroll bias | Mechanical Engineering; Lighting; Heating | 70 | Expired |
| US6050792A | Multi-stage scroll compressor | Mechanical Engineering; Lighting; Heating | 57 | Expired |
| US6129530A | Scroll compressor with a two-piece idler shaft and two piece scroll plates | Emerging Cross-Sectional Technologies | 57 | Expired |
| US4157234A | Scroll-type two stage positive fluid displacement apparatus | Mechanical Engineering; Lighting; Heating | 56 | Expired |
| USD534448S1 | Authentication device | General | 49 | Expired |
| US5466134A | Scroll compressor having idler cranks and strengthening and heat dissipating ribs | Mechanical Engineering; Lighting; Heating | 48 | Expired |
| US6511308B2 | Scroll vacuum pump with improved performance | Emerging Cross-Sectional Technologies | 47 | Expired |
| US6439864B1 | Two stage scroll vacuum pump with improved pressure ratio and performance | Mechanical Engineering; Lighting; Heating | 46 | Expired |
| US4382754A | Scroll-type, positive fluid displacement apparatus with diverse clearances between scroll elements | Mechanical Engineering; Lighting; Heating | 40 | Expired |
| US5632612A | Scroll compressor having a tip seal | Mechanical Engineering; Lighting; Heating | 39 | Expired |
| US5759020A | Scroll compressor having tip seals and idler crank assemblies | Mechanical Engineering; Lighting; Heating | 37 | Expired |
| US7942655B2 | Advanced scroll compressor, vacuum pump, and expander | Mechanical Engineering; Lighting; Heating | 36 | Active |
| US5752816A | Scroll fluid displacement apparatus with improved sealing means | Mechanical Engineering; Lighting; Heating | 35 | Expired |
| US9028230B2 | Three stage scroll vacuum pump | Mechanical Engineering; Lighting; Heating | 34 | Active |
| US9074598B2 | Scroll type device including compressor and expander functions in a single scroll plate pair | Mechanical Engineering; Lighting; Heating | 33 | Active |
| US4219976A | Machine and method for decontaminating nuclear steam generator channel head | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US4141677A | Scroll-type two stage positive fluid-displacement apparatus with intercooler | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US9784139B2 | Compact energy cycle construction utilizing some combination of a scroll type expander, pump, and compressor for operating according to a rankine, an organic rankine, heat pump, or combined organic rankine and heat pump cycle | Mechanical Engineering; Lighting; Heating | 19 | Active |
| US8523544B2 | Three stage scroll vacuum pump | Mechanical Engineering; Lighting; Heating | 18 | Active |
| US9885358B2 | Three stage scroll vacuum pump | Mechanical Engineering; Lighting; Heating | 16 | Active |
| US8668479B2 | Semi-hermetic scroll compressors, vacuum pumps, and expanders | Mechanical Engineering; Lighting; Heating | 16 | Active |
| US4304296A | Body assembly for a fluid cooler | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US4270885A | Unloading means for a gas compressor | Mechanical Engineering; Lighting; Heating | 12 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.