Inventor · disambiguated record
Siegfried Hendrik Hagen
Also filed as: HAGEN SIEGFRIED HENDRIK · VERSPUI GERRIT
3 granted patents·20 citations·filing 1974–1978
68Inventor score
Files withPHILIPS CORP3
Top patents by PatentIndex Score
3 records- 0156US4086559AElectric resistor based on silicon carbide having a negative temperature coefficientPHILIPS CORP·Filed 1975·Granted Apr 25, 1978·8 cites·8 claims
- 0249US4208449AMethod of making an electric resistor having a resistance body consisting of silicon carbide having a negative temperature coefficientPHILIPS CORP·Filed 1978·Granted Jun 17, 1980·6 cites·8 claims
- 0333US3972797AElectrode for electrochemical machiningPHILIPS CORP·Filed 1974·Granted Aug 3, 1976·6 cites·4 claims
Join the waitlist — get patent alerts
Get an alert when Siegfried Hendrik Hagen 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 →