Inventor · disambiguated record
Jan R. De Fries
Also filed as: DE FRIES JAN R · DE FRIES JAN R P · DE FRIES JAN RICHARD
6 granted patents·85 citations·filing 1975–1999
84Inventor score
Top patents by PatentIndex Score
6 records- 0175US5487409ASpool valveFESTO KG·Filed 1994·Granted Jan 30, 1996·26 cites·18 claims
- 0265US5306993ASystem of driving by electric motor machines which work in a periodic manner at torque variable as a function of the angle of rotationSULZER AG·Filed 1992·Granted Apr 26, 1994·14 cites·15 claims
- 0343US6581589B1Solar cell with a solar collector and storage elementsFENT GIUSEPPE·Filed 1999·Granted Jun 24, 2003·18 cites·24 claims
- 0443US5163478ASpool valve having improved sealing characteristicsFESTO KG·Filed 1991·Granted Nov 17, 1992·11 cites·14 claims
- 0539US4900440ADynamic pressure filterSULZER AG·Filed 1988·Granted Feb 13, 1990·9 cites·19 claims
- 0631US4066101AMultiple way valveFRIES JAN RICHARD DE·Filed 1975·Granted Jan 3, 1978·7 cites·9 claims
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