Inventor · disambiguated record
Harold E. Koeln
Also filed as: KOELN HAROLD E
4 granted patents·54 citations·filing 1977–1987
75Inventor score
Top patents by PatentIndex Score
4 records- 0162US4786197ATwist actuated writing instrumentRITEPOINT·Filed 1987·Granted Nov 22, 1988·25 cites·18 claims
- 0254US4161374ATwist retractable writing implementPENN CORP·Filed 1977·Granted Jul 17, 1979·16 cites·5 claims
- 0347US4217712AConical penPENN CORP·Filed 1978·Granted Aug 19, 1980·12 cites·8 claims
- 0428US4257713AConical penPENN CORP·Filed 1978·Granted Mar 24, 1981·1 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →