Inventor · disambiguated record
Richard E. Defreitas
Also filed as: DEFREITAS RICHARD · DEFREITAS RICHARD E
11 granted patents·176 citations·filing 1974–2021
90Inventor score
Files withANALOG & DIGITAL SYSTEMS INC3DELTALAB RES3HYBRID SYSTEMS CORP2AUDIO PULSE INC1DELTALAB RES INC1
Top patents by PatentIndex Score
11 records- 0189US4303800AReproducing multichannel soundANALOG & DIGITAL SYSTEMS INC·Filed 1979·Granted Dec 1, 1981·46 cites·9 claims
- 0288US4053711ASimulation of reverberation in audio signalsAUDIO PULSE INC·Filed 1976·Granted Oct 11, 1977·56 cites·19 claims
- 0380US4009475ADelta-sigma converter and decoderHYBRID SYSTEMS CORP·Filed 1974·Granted Feb 22, 1977·26 cites·7 claims
- 0463US4612654ADigital encoding circuitryANALOG & DIGITAL SYSTEMS INC·Filed 1984·Granted Sep 16, 1986·16 cites·15 claims
- 0558US4313204ADigital encoding circuitry with means to reduce quantization noiseDELTALAB RES·Filed 1979·Granted Jan 26, 1982·10 cites·20 claims
- 0651US12181901B2Automated tank systems and methods for use in oil and gas extraction operationIDEAL COMPLETION SERVICES LLC·Filed 2021·Granted Dec 31, 2024·0 cites·17 claims
- 0746US4305050ACircuitry for generating reference signal for delta encoding systemsDELTALAB RES·Filed 1979·Granted Dec 8, 1981·6 cites·29 claims
- 0846US4190801ADigital encoding circuitryDELTALAB RES INC·Filed 1978·Granted Feb 26, 1980·7 cites·24 claims
- 0945US4254502ADigital encoding circuitryDELTALAB RES·Filed 1979·Granted Mar 3, 1981·7 cites·26 claims
- 1029US4682362AGenerating narrowly-separated variable-frequency clock signalsANALOG & DIGITAL SYSTEMS INC·Filed 1985·Granted Jul 21, 1987·2 cites·4 claims
- 1126USD249885SEnclosure for high fidelity audio reproduction equipmentHYBRID SYSTEMS CORP·Filed 1976·Granted Oct 10, 1978·0 cites·1 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →