Assignee
DUFFIELD ROBERT H
US·3 granted patents·1 pending application·108 citations·filing 1986–2016
Top patents by PatentIndex Score
4 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
- 0346US8896555B2Touch alphabet and communication systemDUFFIELD ROBERT H·Filed 2012·Granted Nov 25, 2014·0 cites·21 claims
- 0434US2017024053A1Touch alphabet and communication systemDUFFIELD ROBERT H·Filed 2016·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when DUFFIELD ROBERT H files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →