Inventor · disambiguated record
Frederik L. Engel
Also filed as: ENGEL FREDERICK LOUIS · ENGEL FREDERIK · ENGEL FREDERIK L
3 granted patents·904 citations·filing 1993–2000
81Inventor score
Top patents by PatentIndex Score
3 records- 0197US5337357AMethod of software distribution protectionSOFTWARE SECURITY INC·Filed 1993·Granted Aug 9, 1994·554 cites·6 claims
- 0293US5781172AData input device for use with a data processing apparatus and a data processing apparatus provided with such a devicePHILIPS CORP·Filed 1997·Granted Jul 14, 1998·312 cites·29 claims
- 0380USRE38242EForce feedback apparatus and methodKONINKL PHILIPS ELECTRONICS NV·Filed 2000·Granted Sep 2, 2003·38 cites·57 claims
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