Inventor · disambiguated record
Erwin A. Frei
Also filed as: FREI ERWIN · FREI ERWIN A
3 granted patents·138 citations·filing 1989–2014
73Inventor score
Top patents by PatentIndex Score
3 records- 0180US5233357ASurveying system including an electro-optic total station and a portable receiving apparatus comprising a satellite position-measuring systemWILD LEITZ AG·Filed 1989·Granted Aug 3, 1993·63 cites·8 claims
- 0271US5252982AMethod of precise position determinationLEICA HEERBRUGG A G·Filed 1991·Granted Oct 12, 1993·73 cites·7 claims
- 0352US10495456B2Method for calibrating a detection device, and detection devicep3d systems GmbH·Filed 2014·Granted Dec 3, 2019·2 cites·17 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →