Inventor · disambiguated record
David Drake Callahan
Also filed as: CALLAHAN DAVID D · CALLAHAN DAVID DRAKE
2 granted patents·1 pending application·181 citations·filing 1991–2014
69Inventor score
Top patents by PatentIndex Score
3 records- 0191US6259972B1Method for processing and disseminating utility outage informationENGHOUSE SYSTEMS USA INC·Filed 1998·Granted Jul 10, 2001·155 cites·24 claims
- 0262US5183147AChemical handling systemMURRAY EQUIPMENT INC·Filed 1991·Granted Feb 2, 1993·26 cites·29 claims
- 0352US2014379602A1Skill-driven education marketplaceAPOLLO EDUCATION GROUP INC·Filed 2014·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when David Drake Callahan 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 →