Sivakumar Gopalnarayanan
36Patents
7h-index
40Co-inventors
69Inventor score
Filing activity: Jun 13, 2000 → Jan 9, 2024
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7552596B2 | Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication | Mechanical Engineering; Lighting; Heating | 27 | Active |
| US6968708B2 | Refrigeration system having variable speed fan | Emerging Cross-Sectional Technologies | 21 | Expired |
| US6698234B2 | Method for increasing efficiency of a vapor compression system by evaporator heating | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US7472557B2 | Automatic refrigerant charging apparatus | Mechanical Engineering; Lighting; Heating | 13 | Active |
| US7386985B2 | Detection of refrigerant charge adequacy based on multiple temperature measurements | Physics | 12 | Active |
| US6647742B1 | Expander driven motor for auxiliary machinery | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US7712319B2 | Refrigerant charge adequacy gauge | Mechanical Engineering; Lighting; Heating | 7 | Active |
| US7419192B2 | Braze-free connector utilizing a sealant coated ferrule | Mechanical Engineering; Lighting; Heating | 7 | Active |
| US7610765B2 | Refrigerant charge status indication method and device | Mechanical Engineering; Lighting; Heating | 6 | Active |
| US7086857B2 | Use of thermal insulation for noise abatement | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US6470691B1 | Fluid transport | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| US6584783B2 | Fluid transport | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| US11585575B2 | Dual-circuit heating, ventilation, air conditioning, and refrigeration systems and associated methods | Mechanical Engineering; Lighting; Heating | 1 | Active |
| US11435101B2 | Air mover refrigerant leak detection and risk mitigation | Mechanical Engineering; Lighting; Heating | 1 | Active |
| US10982887B2 | Expansion valve with selectable operation modes | Emerging Cross-Sectional Technologies | 1 | Active |
| US11209204B2 | Heat pump system defrosting operations | Mechanical Engineering; Lighting; Heating | 1 | Active |
| US11668503B2 | Expansion valve with selectable operation modes | Emerging Cross-Sectional Technologies | 0 | Active |
| US11548055B2 | Systems and methods for heat exchanger manufacturing | Performing Operations; Transporting | 0 | Active |
| US12135156B2 | Air conditioning reheat systems and methods thereto | Emerging Cross-Sectional Technologies | 0 | Active |
| US12173909B2 | Integrated space conditioning and water heating/cooling systems and methods thereto | Mechanical Engineering; Lighting; Heating | 0 | Active |
| US11530857B2 | Air conditioning reheat systems and methods thereto | Emerging Cross-Sectional Technologies | 0 | Active |
| US11821662B2 | Thermal energy storage integrated heat pump | Emerging Cross-Sectional Technologies | 0 | Active |
| US11781760B2 | Integrated space conditioning and water heating systems and methods thereto | Mechanical Engineering; Lighting; Heating | 0 | Active |
| US11338352B2 | Pressure expansion methods for heat exchanger manufacturing | Emerging Cross-Sectional Technologies | 0 | Active |
| US11808494B2 | Heat pump water heater systems and methods for low ambient temperature conditions | Mechanical Engineering; Lighting; Heating | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.