Canadian Patents and Development Limited
421Patents
0Active
421Granted
42Portfolio score
Filing activity: Dec 10, 1971 → Nov 16, 1989
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4452773A | Magnetic iron-dextran microspheres | Physics | 455 | Expired |
| US4347686A | Fin-stabilized container of foldable sheet material | Emerging Cross-Sectional Technologies | 314 | Expired |
| US4026632A | Frequency selective interwaveguide coupler | Physics | 260 | Expired |
| US4542449A | Lighting panel with opposed 45.degree. corrugations | Mechanical Engineering; Lighting; Heating | 231 | Expired |
| US4356170A | Immunogenic polysaccharide-protein conjugates | Emerging Cross-Sectional Technologies | 207 | Expired |
| US4414621A | Interactive visual communications system | Physics | 206 | Expired |
| US4219847A | Method and apparatus of determining the center of area or centroid of a geometrical area of unspecified shape lying in a larger x-y scan field | Physics | 170 | Expired |
| US4763977A | Optical fiber coupler with tunable coupling ratio and method of making | Emerging Cross-Sectional Technologies | 164 | Expired |
| US4260220A | Prism light guide having surfaces which are in octature | Physics | 158 | Expired |
| US4567602A | Correlated signal processor | Electricity | 156 | Expired |
| US4651716A | Method and device for enhancement of cardiac contractility | Human Necessities | 139 | Expired |
| US4615579A | Prism light guide luminaire | Physics | 136 | Expired |
| US4550736A | Movement artifact detector for sleep analysis | Human Necessities | 132 | Expired |
| US4196332A | Controlled heating microwave ovens | Emerging Cross-Sectional Technologies | 124 | Expired |
| US4700197A | Adaptive array antenna | Electricity | 122 | Expired |
| US4826299A | Linear deiverging lens | Physics | 122 | Expired |
| US4900119A | Wavelength selective optical devices using optical directional coupler | Physics | 115 | Expired |
| US4481640A | Spread spectrum modem | Electricity | 109 | Expired |
| US4393869A | Electronically controlled respirator | Human Necessities | 105 | Expired |
| US4067060A | Transfer function measurement | Physics | 99 | Expired |
| US4707064A | Optical mixing/demixing device | Physics | 88 | Expired |
| US4618735A | Process and apparatus for the conversion of sludges | Emerging Cross-Sectional Technologies | 85 | Expired |
| US4158656A | Oilseed processing | Human Necessities | 83 | Expired |
| US4306545A | Re-entrant cannula device | Emerging Cross-Sectional Technologies | 82 | Expired |
| US4627734A | Three dimensional imaging method and device | Physics | 82 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.