Inventor · disambiguated record
Joseph Z. Zdrok
Also filed as: ZDROK JOSEPH · ZDROK JOSEPH Z
9 granted patents·601 citations·filing 1982–1996
92Inventor score
Top patents by PatentIndex Score
9 records- 0194US4600002ADisposable respiratorAMERICAN OPTICAL CORP·Filed 1984·Granted Jul 15, 1986·171 cites·7 claims
- 0293USD287649SDisposable respiratorAMERICAN OPTICAL CORP·Filed 1984·Granted Jan 6, 1987·47 cites·1 claims
- 0392US5794617AFace mask and retainerGERSON CO INC LOUIS M·Filed 1996·Granted Aug 18, 1998·134 cites·13 claims
- 0490USD286213SDual filter respiratorMARYYANEK RICHARD D·Filed 1983·Granted Oct 14, 1986·39 cites·1 claims
- 0588US5299448APositive pressure test apparatus for facepiece respiratorCABOT SAFETY CORP·Filed 1993·Granted Apr 5, 1994·112 cites·14 claims
- 0678US4592350ARespiratorAMERICAN OPTICAL CORP·Filed 1985·Granted Jun 3, 1986·60 cites·6 claims
- 0772USD340316STest probe for facepiece respiratorsCABOT SAFETY CORP·Filed 1991·Granted Oct 12, 1993·16 cites·1 claims
- 0857USD270957SRespiratorAMERICAN OPTICAL CORP·Filed 1982·Granted Oct 11, 1983·6 cites·1 claims
- 0948US5373869ATest probe for face piece respiratorsCABOT SAFETY CORP·Filed 1993·Granted Dec 20, 1994·16 cites·2 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →