Inventor · disambiguated record
John Schaefer
Also filed as: SCHAEFER JOHN · SCHAEFER JOHN S
5 granted patents·2 pending applications·339 citations·filing 1996–2023
83Inventor score
Top patents by PatentIndex Score
7 records- 0197US5838239ASystem for detecting ice or snow on surface which specularly reflects lightROBOTIC VISION SYSTEMS·Filed 1996·Granted Nov 17, 1998·176 cites·74 claims
- 0293US6069565ASystem for detecting ice or snow on surface which specularly reflects lightROSEMOUNT AEROSPACE INC·Filed 1998·Granted May 30, 2000·119 cites·14 claims
- 0376US6462555B1Apparatus for detecting a completed electrical circuit, reverse polarity, ground and ground fault interrupterFiled 2001·Granted Oct 8, 2002·30 cites·8 claims
- 0471US2023266117A1Wafer inspection system including a laser triangulation sensorONTO INNOVATION INC·Filed 2023·Application pending·0 cites
- 0556US11578967B2Wafer inspection system including a laser triangulation sensorRUDOLPH TECH INC·Filed 2018·Granted Feb 14, 2023·0 cites·15 claims
- 0645US6246225B1Apparatus for detecting a completed electrical circuit and testing an electrical output receptacleFiled 1999·Granted Jun 12, 2001·14 cites·6 claims
- 0740US2020357704A1Laser triangulation sensor system and method for wafer inspectionONTO INNOVATION INC·Filed 2018·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when John Schaefer 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 →