Inventor · disambiguated record

John M. Zwiegel

Also filed as: ZWIEGEL JOHN M

2 granted patents·40 citations·filing 1985–1990

62Inventor score

Technology areasE21B F16K

Files withCOOPER IND INC1 GRAY TOOL CO1

Top patents by PatentIndex Score

2 records

0150US5031696ACasing hanger and sealCOOPER IND INC·Filed 1990·Granted Jul 16, 1991·31 cites·18 claims
0237US4643390AFail-safe valve actuatorGRAY TOOL CO·Filed 1985·Granted Feb 17, 1987·9 cites·5 claims

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