Inventor · disambiguated record
Michael F. Welsh
Also filed as: WELSH MICHAEL F
4 granted patents·126 citations·filing 1988–1992
80Inventor score
Technology areasE21B
Top patents by PatentIndex Score
4 records- 0166US5360076ADual metal face seal with single recessed energizerHUGHES TOOL CO·Filed 1992·Granted Nov 1, 1994·47 cites·6 claims
- 0262US4903786AEarth boring bit with improved two piece bearing and seal assemblyHUGHES TOOL CO·Filed 1988·Granted Feb 27, 1990·35 cites·3 claims
- 0354US4923020ARock bit with rigid face seals and recessed energizersHUGHES TOOL CO·Filed 1988·Granted May 8, 1990·31 cites·12 claims
- 0436US5307887AEarth boring bit with improved thrust bearingBAKER HUGHES INC·Filed 1992·Granted May 3, 1994·13 cites·12 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →