Inventor · disambiguated record

Charles R. Hallengren

Also filed as: HALLENGREN CHARLES R · HALLENGREN CHARLES RICHARD

2 granted patents·32 citations·filing 1975–1979

61Inventor score

Technology areasB21H B29C

Files withILLINOIS TOOL WORKS2

Top patents by PatentIndex Score

2 records

0169US4289006AApparatus for producing threaded self-tapping stainless steel screwsILLINOIS TOOL WORKS·Filed 1979·Granted Sep 15, 1981·25 cites·5 claims
0228US3954375AMandrel and preform assemblyILLINOIS TOOL WORKS·Filed 1975·Granted May 4, 1976·7 cites·7 claims

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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →