Ralph E. Roper
26Patents
11h-index
8Co-inventors
68Inventor score
Filing activity: Jun 11, 1976 → Mar 7, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5481892A | Apparatus and method for forming a tubular member | Emerging Cross-Sectional Technologies | 53 | Expired |
| US5353618A | Apparatus and method for forming a tubular frame member | Emerging Cross-Sectional Technologies | 38 | Expired |
| US5239852A | Apparatus and method for forming a tubular frame member | Emerging Cross-Sectional Technologies | 35 | Expired |
| US4738695A | Gas removal system | Emerging Cross-Sectional Technologies | 31 | Expired |
| US5890387A | Apparatus and method for forming and hydropiercing a tubular frame member | Emerging Cross-Sectional Technologies | 21 | Expired |
| US5157969A | Apparatus and method for hydroforming sheet metal | Emerging Cross-Sectional Technologies | 21 | Expired |
| US5372026A | Apparatus and method for hydroforming sheet metal | Emerging Cross-Sectional Technologies | 19 | Expired |
| US6390457B1 | Soft-start, soft-return gas spring | Chemistry; Metallurgy | 16 | Expired |
| US4576030A | Stretch form die | Performing Operations; Transporting | 14 | Expired |
| US5499520A | Apparatus for forming a tubular frame member | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5372027A | Controlled material flow hydroforming | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5533372A | Controlled material flow hydroforming | Emerging Cross-Sectional Technologies | 10 | Expired |
| US5865054A | Apparatus and method for forming a tubular frame member | Emerging Cross-Sectional Technologies | 10 | Expired |
| US6068245A | Apparatus and method for cushioning the action of draw dies operating in a stamping press and the like | Performing Operations; Transporting | 9 | Expired |
| US4295357A | Apparatus for making metal outers and inners | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US4238949A | Process and apparatus for making metal outers and inners | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US7144362B2 | Method for chemically stabilizing waste materials containing multivalent oxyanions | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6622831B2 | Soft-start, soft-return gas spring | Chemistry; Metallurgy | 5 | Expired |
| US4062215A | Process for expanding wheel components | Performing Operations; Transporting | 4 | Expired |
| US4536931A | Bearing burnishing method and apparatus | Emerging Cross-Sectional Technologies | 3 | Expired |
| US9034285B1 | Use of ferrous sulfide suspension for the removal of mercury from flue gases | Chemistry; Metallurgy | 3 | Active |
| US5802898A | Apparatus for forming a tubular frame member | Emerging Cross-Sectional Technologies | 3 | Expired |
| US9073008B2 | Use of ferrous sulfide suspension for the removal of mercury from flue gases | Performing Operations; Transporting | 2 | Active |
| US7767188B2 | Calcium-sodium polysulfide chemical reagent and production methods | Emerging Cross-Sectional Technologies | 0 | Active |
| US7534413B2 | Calcium-sodium polysulfide chemical reagent and production methods | Emerging Cross-Sectional Technologies | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.