Marconi Instruments Limited
56Patents
0Active
56Granted
39Portfolio score
Filing activity: Jul 14, 1975 → Nov 14, 1996
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4320361A | Amplitude and frequency modulators using a switchable component controlled by data signals | Electricity | 111 | Expired |
| US4914405A | Frequency synthesizer | Electricity | 105 | Expired |
| US4609881A | Frequency synthesizers | Electricity | 60 | Expired |
| US5781600A | Frequency synthesizer | Electricity | 47 | Expired |
| US5079522A | Variable frequency signal generator | Electricity | 33 | Expired |
| US4434489A | Automatic test systems | Emerging Cross-Sectional Technologies | 32 | Expired |
| US4651089A | Frequency counting arrangement | Physics | 26 | Expired |
| US4780086A | Electrical interface arrangement | Physics | 22 | Expired |
| US4810960A | Measuring adjacent channel power | Electricity | 20 | Expired |
| US5010560A | Data logging apparatus | Physics | 19 | Expired |
| US4362394A | Time interval measurement arrangement | Physics | 18 | Expired |
| US4295093A | Spectrum analysers | Physics | 18 | Expired |
| US4808912A | Six-port reflectometer test arrangement and method including calibration | Physics | 17 | Expired |
| US4342007A | Swept frequency oscillator with compensation for variations in tuning sensitivity | Electricity | 16 | Expired |
| US4868512A | Phase detector | Physics | 15 | Expired |
| US4582491A | Training apparatus | Physics | 15 | Expired |
| US4536051A | Electrical interface arrangements | Physics | 14 | Expired |
| US4543542A | Phase locked loop frequency and phase modulators | Electricity | 13 | Expired |
| US4309674A | Frequency modulators with compensation for variations in modulation sensitivity | Electricity | 12 | Expired |
| US4013961A | A.M. Signal generator having an r.f. output level control | Electricity | 12 | Expired |
| US4984254A | Frequency counter | Physics | 12 | Expired |
| US4143342A | Micro-circuit arrangements | Electricity | 12 | Expired |
| US4838070A | Method and apparatus for dry testing water-immersible acoustic transducers | Physics | 11 | Expired |
| US4870384A | Frequency or phase modulation | Electricity | 11 | Expired |
| US5399975A | Method of testing continuity of a connection between an integrated circuit and a printed circuit board by current probing integrated circuit | Physics | 11 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.