Ralph C. Longsworth
73Patents
16h-index
23Co-inventors
84Inventor score
Filing activity: May 16, 1977 → Aug 25, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5452582A | Cryo-probe | Mechanical Engineering; Lighting; Heating | 241 | Expired |
| US4781033A | Heat exchanger for a fast cooldown cryostat | Mechanical Engineering; Lighting; Heating | 57 | Expired |
| US4279127A | Removable refrigerator for maintaining liquefied gas inventory | Emerging Cross-Sectional Technologies | 46 | Expired |
| US4277949A | Cryostat with serviceable refrigerator | Emerging Cross-Sectional Technologies | 45 | Expired |
| US5337572A | Cryogenic refrigerator with single stage compressor | Mechanical Engineering; Lighting; Heating | 40 | Expired |
| US4223540A | Dewar and removable refrigerator for maintaining liquefied gas inventory | Emerging Cross-Sectional Technologies | 37 | Expired |
| US5461873A | Means and apparatus for convectively cooling a superconducting magnet | Emerging Cross-Sectional Technologies | 32 | Expired |
| US6256997A | Reduced vibration cooling device having pneumatically-driven GM type displacer | Mechanical Engineering; Lighting; Heating | 28 | Expired |
| US5579654A | Cryostat refrigeration system using mixed refrigerants in a closed vapor compression cycle having a fixed flow restrictor | Emerging Cross-Sectional Technologies | 28 | Expired |
| US5586437A | MRI cryostat cooled by open and closed cycle refrigeration systems | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US4150549A | Cryopumping method and apparatus | Emerging Cross-Sectional Technologies | 25 | Expired |
| US4785879A | Parallel wrapped tube heat exchanger | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US5595065A | Closed cycle cryogenic refrigeration system with automatic variable flow area throttling device | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US5687574A | Throttle cycle cryopumping system for Group I gases | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4484458A | Apparatus for condensing liquid cryogen boil-off | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4606201A | Dual thermal coupling | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US4277951A | Cryopumping apparatus | Emerging Cross-Sectional Technologies | 15 | Expired |
| US6629418B1 | Two-stage inter-phasing pulse tube refrigerators with and without shared buffer volumes | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US4593530A | Method and apparatus for improving the sensitivity of a leak detector utilizing a cryopump | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5628195A | Vibrationally isolated thermal system for a cryogenically cooled device | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US5402648A | Sealed dewar with separate circulation loop for external cooling at constant pressure | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4514204A | Bakeable cryopump | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US5243826A | Method and apparatus for collecting liquid cryogen | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US6488120B1 | Fail-safe oil lubricated helium compressor unit with oil-free gas delivery | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US5249425A | Venting control system for cryostats | Mechanical Engineering; Lighting; Heating | 10 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.