Inventor · disambiguated record
John A. Duff
Also filed as: DUFF JOHN A · DUFF JOHN ALAN
3 granted patents·2 pending applications·1 citations·filing 2012–2022
49Inventor score
Top patents by PatentIndex Score
5 records- 0170US12138491B2Powered exhaust apparatus for a personal protection respiratory device3M INNOVATIVE PROPERTIES COMPANY·Filed 2022·Granted Nov 12, 2024·0 cites·16 claims
- 0259US9404952B2Conductivity measurement of fluidsASEPTIA INC·Filed 2012·Granted Aug 2, 2016·1 cites·18 claims
- 0351US2016377568A1Conductivity Measurement of FluidsASEPTIA INC·Filed 2016·Application pending·0 cites
- 0446US2018185677A1Powered Exhaust Apparatus For A Personal Protection Respiratory Device3M INNOVATIVE PROPERTIES CO·Filed 2016·Application pending·0 cites
- 0539US11554233B2Powered apparatus for a personal protection respiratory device3M INNOVATIVE PROPERTIES COMPANY·Filed 2018·Granted Jan 17, 2023·0 cites·19 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →