EGG CO., LTD.
35Patents
1Active
35Granted
40Portfolio score
Filing activity: Nov 5, 1974 → Jun 27, 2019
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4712722A | Concurrent ultrasonic weld evaluation system | Physics | 346 | Expired |
| US6181084A | Ballast circuit for high intensity discharge lamps | Emerging Cross-Sectional Technologies | 64 | Expired |
| US4020379A | Bulb-shaped flashtube with metal envelope | Electricity | 44 | Expired |
| US5189902A | Humidity sensor, and a measurement installation including a plurality of such sensors | Physics | 35 | Expired |
| US4929329A | Electrophoresis cassette system with apparatus and method for filling same | Physics | 34 | Expired |
| US4232380A | Underwater mapping apparatus and method | Physics | 30 | Expired |
| US4198702A | Time varying gain amplifier for side scan sonar applications | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5155666A | Light beacon for marking tall obstructions | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US6234081A | Shaped bridge slapper | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US5164066A | Electrophoresis cassette system with apparatus and method for filling same | Physics | 23 | Expired |
| US4823951A | Retainer for holding a printed circuit card between spaced surfaces | Electricity | 21 | Expired |
| US4494085A | Miniaturized atomic frequency standard having both filter cell and absorption cell in resonator cavity | Physics | 21 | Expired |
| US5532474A | Active quench circuit and reset circuit for avalanche photodiode | Electricity | 19 | Expired |
| US4476445A | Methods and apparatus for rapid and accurate frequency syntonization of an atomic clock | Physics | 17 | Expired |
| US4889350A | Bellows seal arrangement | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US4629333A | Chilled mirror hygrometer with performance monitoring | Physics | 15 | Expired |
| US4485333A | Vapor discharge lamp assembly | Electricity | 14 | Expired |
| US4939482A | Remote optical sensing device and method | Electricity | 13 | Expired |
| US5198816A | General purpose system for digitizing an analog signal | Physics | 13 | Expired |
| US3991267A | Method for producing a compressed digital representation of a visible image | Electricity | 12 | Expired |
| US4919784A | Electrophorresis cassette spacer | Physics | 10 | Expired |
| US5050894A | Sealing device designed to achieve sealing between two parts having a possibility of relative rotation to a limited extent | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US4345455A | Dew point hygrometer with continuous balancing system | Physics | 9 | Expired |
| US3977685A | Rotating bellows seal | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US5583352A | Low-noise, reach-through, avalanche photodiodes | Emerging Cross-Sectional Technologies | 7 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.