Inventor · disambiguated record
Robert H. Duffield
Also filed as: DUFFIELD ROBERT · DUFFIELD ROBERT H
5 granted patents·2 pending applications·169 citations·filing 1976–2016
81Inventor score
Top patents by PatentIndex Score
7 records- 0183US9280229B2Touch alphabet and communication systemDUFFIELD ROBERT H·Filed 2014·Granted Mar 8, 2016·8 cites·11 claims
- 0283US4744006AApparatus for expanding the input/output capabilities of a personal computerDUFFIELD ROBERT H·Filed 1986·Granted May 10, 1988·100 cites·27 claims
- 0380US4193520ADevice for adding soap to shower waterDUFFIELD ROBERT·Filed 1977·Granted Mar 18, 1980·48 cites·2 claims
- 0452US4122684AMethod for the recovery of volatile liquidsBP CHEM INT LTD·Filed 1976·Granted Oct 31, 1978·13 cites·10 claims
- 0546US8896555B2Touch alphabet and communication systemDUFFIELD ROBERT H·Filed 2012·Granted Nov 25, 2014·0 cites·21 claims
- 0636US2013257732A1Adaptive virtual keyboardDUFFIELD ROBERT·Filed 2012·Application pending·0 cites
- 0734US2017024053A1Touch alphabet and communication systemDUFFIELD ROBERT H·Filed 2016·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →