Inventor · disambiguated record
Norbert Holken
Also filed as: HOELKEN NORBERT · HOLKEN NORBERT
3 granted patents·73 citations·filing 1975–1991
73Inventor score
Top patents by PatentIndex Score
3 records- 0174US5238252AShut-off fittings with a sealing deviceSCHILLING H EISENWERK·Filed 1991·Granted Aug 24, 1993·47 cites·14 claims
- 0261US4293247ASeals for mine roof supportsGEWERK EISENHUETTE WESTFALIA·Filed 1979·Granted Oct 6, 1981·10 cites·23 claims
- 0360US4004771ABall-and-socket type connections for use with mining apparatusGEWERK EISENHUETTE WESTFALIA·Filed 1975·Granted Jan 25, 1977·16 cites·24 claims
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