Inventor · disambiguated record
Derek Plummer
Also filed as: PLUMMER DEREK
5 granted patents·38 citations·filing 1975–1979
78Inventor score
Technology areasE21D
Files withCOAL INDUSTRY PATENTS LTD5
Top patents by PatentIndex Score
5 records- 0170US4302054ACutter unit assemblies for excavating machines and to excavating machines including cutter unit assembliesCOAL INDUSTRY PATENTS LTD·Filed 1979·Granted Nov 24, 1981·17 cites·9 claims
- 0259US4136910AExcavating machinesCOAL INDUSTRY PATENTS LTD·Filed 1975·Granted Jan 30, 1979·9 cites·16 claims
- 0352US3979151ARock excavating arched tunnel forming machineCOAL INDUSTRY PATENTS LTD·Filed 1975·Granted Sep 7, 1976·8 cites·11 claims
- 0433US4095434AMine equipmentCOAL INDUSTRY PATENTS LTD·Filed 1975·Granted Jun 20, 1978·3 cites·26 claims
- 0528US4229042AExcavating machinesCOAL INDUSTRY PATENTS LTD·Filed 1978·Granted Oct 21, 1980·1 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →