Ontario Hydro
33Patents
0Active
33Granted
40Portfolio score
Filing activity: May 20, 1987 → Aug 21, 1998
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5136855A | Heat pump having an accumulator with refrigerant level sensor | Mechanical Engineering; Lighting; Heating | 79 | Expired |
| US5859484A | Radioisotope-powered semiconductor battery | Physics | 73 | Expired |
| US4959523A | Method and apparatus for automatically sensing the configuration of a surface area and effecting a work function thereon | Physics | 58 | Expired |
| US5606213A | Nuclear batteries | Physics | 46 | Expired |
| US5527445A | Process and apparatus for in situ electroforming a structural layer of metal bonded to an internal wall of a metal tube | Mechanical Engineering; Lighting; Heating | 41 | Expired |
| US5252915A | Method and apparatus for detecting stator faults in rotary dynamoelectric machines | Physics | 41 | Expired |
| US5141074A | Lineman's pole strap assembly | Human Necessities | 31 | Expired |
| US5669224A | Direct expansion ground source heat pump | Emerging Cross-Sectional Technologies | 30 | Expired |
| US5956463A | Audio monitoring system for assessing wildlife biodiversity | Emerging Cross-Sectional Technologies | 27 | Expired |
| US5396172A | Transformer fault analyzer | Physics | 26 | Expired |
| US5143187A | Energy absorber for horizontal lifelines in fall arrest systems | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US5516969A | Waste oil decontamination process | Physics | 20 | Expired |
| US5902510A | Rotary microwave oven for continuous heating of materials | Electricity | 18 | Expired |
| US5262717A | Method and apparatus for measuring electric motor efficiency and loading | Physics | 16 | Expired |
| US5191183A | Apparatus for processing ceramics using microwave oven with resistance heating unit | Electricity | 13 | Expired |
| US5561679A | Radioluminescent semiconductor light source | Electricity | 12 | Expired |
| US5538615A | Metal tube having a section with an internal electroformed structural layer | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US6264172A | Electric fence | Human Necessities | 10 | Expired |
| US5343045A | Method and device for measuring moisture content | Physics | 7 | Expired |
| US5337854A | Jib assembly | Performing Operations; Transporting | 7 | Expired |
| US5516415A | Process and apparatus for in situ electroforming a structural layer of metal bonded to an internal wall of a metal tube | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US5286468A | Producing carbon-14 isotope from spent resin waste | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US5511308A | Method and apparatus for turbine blade rehabilitation | Emerging Cross-Sectional Technologies | 7 | Expired |
| US6045099A | Support member for use in constructing electrified fence | Electricity | 6 | Expired |
| US5291858A | Sound conditioning in fish | Emerging Cross-Sectional Technologies | 6 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.