Christopher B. Marshall
43Patents
13h-index
36Co-inventors
81Inventor score
Filing activity: Feb 4, 1982 → May 24, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4768187A | Signal transmission system and a transmitter and a receiver for use in the system | Electricity | 138 | Expired |
| US4488119A | FM Demodulator | Electricity | 90 | Expired |
| US6618671B2 | Method of determining the position of a mobile unit | Physics | 77 | Expired |
| US7010267B2 | Arrangement with beacon for providing information service | Electricity | 52 | Expired |
| US4723318A | Active polyphase filters | Electricity | 46 | Expired |
| US4696055A | RF tuning circuit which provides image frequency rejection | Electricity | 46 | Expired |
| US4864643A | Radio transmission system providing adjacent channel and image frequency rejection | Electricity | 32 | Expired |
| US4523324A | Direct modulation FM data receiver | Electricity | 32 | Expired |
| US4713563A | d.c. Block capacitor circuit for rejection of d.c. offset | Electricity | 26 | Expired |
| US5678199A | Transceiver with controlled transmit/receive impedance switching device | Electricity | 16 | Expired |
| US5502744A | Data coding system | Electricity | 16 | Expired |
| US7183925B2 | Interactive system using tags | Physics | 14 | Expired |
| US4672636A | AFC circuit for direct modulation FM data receivers | Electricity | 13 | Expired |
| US5832374A | Radio transceiver including transmitter power control circuit | Electricity | 11 | Expired |
| US5852634A | Data coding system | Electricity | 7 | Expired |
| US4994994A | Apparatus performing modulo p addition, where operands are expressed as powers of a generator, using a reduced size zech look-up table | Physics | 7 | Expired |
| US8804551B2 | Location estimation by observing wireless signals | Electricity | 6 | Active |
| US5991607A | Telecommunication device with switching arrangement constructed as a ring circuit | Electricity | 6 | Expired |
| US5008849A | Apparatus adding values represented as residues in modulo arithmetic | Physics | 5 | Expired |
| US7103340B2 | Antenna diversity arrangement | Electricity | 4 | Expired |
| US7233282B2 | GPS receiver with encrypted data transmission | Physics | 3 | Expired |
| US7089112B2 | Method of determining the position of a mobile unit | Physics | 3 | Expired |
| US9681408B2 | Determining clock-drift using signals of opportunity | Physics | 3 | Active |
| US9035827B2 | Positioning using a local wave-propagation model | Physics | 2 | Active |
| US8779980B2 | Position validation | Physics | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.