Inventor · disambiguated record
John Trett
Also filed as: TRETT JOHN
9 granted patents·377 citations·filing 1981–1992
91Inventor score
Top patents by PatentIndex Score
9 records- 0194US4910464AProximity detectorFORMULA SYSTEMS LTD·Filed 1988·Granted Mar 20, 1990·94 cites·4 claims
- 0291US5420430ADetection systems for detecting obstructions in doorwaysFORMULA SYSTEMS LTD·Filed 1992·Granted May 30, 1995·54 cites·21 claims
- 0390US4894952AProximity detectorFORMULA SYSTEMS LTD·Filed 1986·Granted Jan 23, 1990·73 cites·10 claims
- 0489US4427095AMonitoring and controlling lift positionsPAYNE REGINALD K·Filed 1981·Granted Jan 24, 1984·46 cites·12 claims
- 0583US4976337AProximity detection systemsFORMULA SYSTEMS LTD·Filed 1988·Granted Dec 11, 1990·52 cites·9 claims
- 0683US4506765AProximity detector circuitry especially for lift doorsPAYNE REGINALD K·Filed 1982·Granted Mar 26, 1985·30 cites·9 claims
- 0749US4864296ASystem for synchronizing signals on a two-wire lineFORMULA SYSTEMS LTD·Filed 1988·Granted Sep 5, 1989·13 cites·4 claims
- 0841US5053616APhotoelectric array detection circuitry with dual gating meansFORMULA SYSTEMS LTD·Filed 1989·Granted Oct 1, 1991·10 cites·12 claims
- 0939US4839605ASignal compensation circuitsFORMULA SYSTEMS LTD·Filed 1987·Granted Jun 13, 1989·5 cites·12 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →