Inventor · disambiguated record
Douglas R. Engfer
Also filed as: ENGFER DOUGLAS R
3 granted patents·1 pending application·51 citations·filing 2007–2017
74Inventor score
Top patents by PatentIndex Score
4 records- 0192US9881062B2Operation and method for prediction and management of the validity of subject reported dataERESEARCHTECHNOLOGY INC·Filed 2015·Granted Jan 30, 2018·10 cites·42 claims
- 0288US7873589B2Operation and method for prediction and management of the validity of subject reported dataINVIVODATA INC·Filed 2007·Granted Jan 18, 2011·31 cites·51 claims
- 0376US9129215B2Operation and method for prediction and management of the validity of subject reported dataSHIFFMAN SAUL·Filed 2010·Granted Sep 8, 2015·10 cites·93 claims
- 0453US2018150523A1Operation and Method for Prediction and Management of the Validity of Subject Reported DataERESEARCHTECHNOLOGY INC·Filed 2017·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when Douglas R. Engfer files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →